EP0539581A1 - Integrity sensor for fluid jet nozzle. - Google Patents

Integrity sensor for fluid jet nozzle.

Info

Publication number
EP0539581A1
EP0539581A1 EP92915282A EP92915282A EP0539581A1 EP 0539581 A1 EP0539581 A1 EP 0539581A1 EP 92915282 A EP92915282 A EP 92915282A EP 92915282 A EP92915282 A EP 92915282A EP 0539581 A1 EP0539581 A1 EP 0539581A1
Authority
EP
European Patent Office
Prior art keywords
fluid
sensor
chamber
fluid jet
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92915282A
Other languages
German (de)
French (fr)
Other versions
EP0539581B1 (en
Inventor
Wei-Long Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ingersoll Rand Co
Original Assignee
Ingersoll Rand Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ingersoll Rand Co filed Critical Ingersoll Rand Co
Publication of EP0539581A1 publication Critical patent/EP0539581A1/en
Application granted granted Critical
Publication of EP0539581B1 publication Critical patent/EP0539581B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0069—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with means for preventing clogging of the equipment or for preventing abrasive entering the airway

Definitions

  • This invention relates generally to fluid jet nozzles and more particularly to a flow sensor located in a chamber downstream of the orifice to sense the flow characteristics of the fluid jet, and the condition of the nozzle orifice.
  • Abrasive fluid jet cutters and cleaners are an especially difficult to monitor since the flow characteristics of the fluid jet downstream of the funnel tube can be affected not only by the condition of the orifice and specifics of the fluid jet adjacent the orifice, but also by the configuration and dimensions of the chamber and funnel tube and the type and amount of abrasives being used. Monitoring whether the fluid jet is within permissible limits and causes of the flow abnormalities in the fluid jet is therefore difficult.
  • this is accomplished by providing an apparatus which includes a nozzle assembly having a nozzle orifice formed therein.
  • a highly pressurized fluid source is in fluid communication with the nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly.
  • a sensor is in fluid communication with the chamber for sensing the fluid condition in said chamber which provides an indication of the quality of the nozzle orifice.
  • Fig. 1 is side cross sectional view illustrating an embodiment of non - abrasive fluid jet nozzle apparatus including a sensor of the present invention
  • Fig. 2 is a side cross sectional view illustrating an alternate embodiment of abrasive fluid jet nozzle apparatus including a plurality of sensors of the present invention
  • Fig. 3 is a side cross sectional view illustrating yet another alternate embodiment of fluid jet nozzle apparatus with sensor, including alignment means to align the position of the fluid jet nozzle apparatus relative to the workpiece; and
  • Fig. 4 is a side cross sectional view illustrating a final embodiment of fluid jet nozzle apparatus with sensor, including alignment means to align the position of the workpiece relative to the fluid jet nozzle apparatus.
  • Fig. 1 illustrates a fluid jet nozzle apparatus 10.
  • the fluid jet nozzle apparatus 10 includes a nozzle assembly 12, a nozzle tube 14 and a nozzle nut 16.
  • the nozzle assembly 12 has a nozzle orifice 18 formed therein as is well known in the art.
  • the nozzle tube 14 is in fluid communication with the nozzle orifice 18, wherein a fluid jet 20 is produced downstream of the nozzle assembly 12 into a chamber 22.
  • a sensor 24 is in fluid communication with the chamber 22.
  • Either a flow meter 25 or a pressure sensor 27 may be used as a sensor 24 in the present application. Both types of sensors provide reliable indication to the condition of the fluid jet 20. It may be desired to provide both a pressure sensor 27 and a flow meter 25. Especially in situations where the sensor is monitored by a computer, an acceptable value for the pressure indicated by the pressure sensor 27 can be within a preset range for a specified range indicated by the flow meter 25, or vice versa.
  • Sensors of this type may be applied to either non-abrasive fluid jet cutting applications, as illustrated in Fig. 1, or to abrasive fluid jet cutting applications as illustrated in Fig. 2.
  • an abrasive inlet means 26 is in fluid communication with the chamber 22.
  • a funnel tube 28 is located downstream of the chamber 22, and is coaxial with the fluid jet 20.
  • One or more control valves 30 may be applied to control the fluid flow abrasive inlet means 26 or sensor 24. Using the control valves 30, the sensor 24 and the abrasive inlet means 26 may be applied as desired.
  • abrasive fluid jet cutting applications there exists an optimum abrasive feeding rate which depends upon the operational parameters of the fluid jet cutter (the relevant parameters include the size of the nozzle orifice 18, the size of the funnel tube 28, the fluid pressure and the type and size of abrasives added to the fluid.
  • the present invention provides the operator with a reliable and quantitative indication of whether the funnel tube 28 meets acceptable standards.
  • the operator has to continually observe the fluid jet stream and using non-quantitative standards and determine when the nozzle fell below the desired standards.
  • the prior art requires a skilled operator to function properly.
  • Yet another application in abrasive fluid jet cutting is the detection of the clogging of the funnel tube 28 during the cutting process by injected garnet particles of large dimensions. This clogging quickly becomes apparent by the sensor 24 indications.
  • the sensor 24 may range in complexity from a visual sensor which has to be observed by the operator to one which sends signals to a microprocessor 32.
  • the microprocessor can be used to stop application of fluid to the nozzle tube 14 when the quality of the fluid stream goes below a preset limit.
  • the information from the microprocessor can even be input into an alignment means 33. This assumes that when the quality of the fluid jet decreases, the stream will become wider, and the cutting kerf 34 (width of a workpiece 36 which is cut by the fluid jet 20) will widen.
  • the adjustment means can reposition the orientation of the fluid jet nozzle apparatus 10 relative to the workpiece to compensate for the increase in dimension of the fluid jet. It is to be understood that the adjustment means can reposition either the fluid jet nozzle apparatus 10 (see Fig. 3) or the workpiece 36 (see Fig. 4).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Dispositif (10) comprenant un ensemble ajutage (12) constitué d'un orifice d'ajutage (18). Une source de fluide fortement pressurisé est en communication fluidique avec l'orifice d'ajutage (18), un jet de fluide (20) étant expulsé par ledit orifice d'ajutage (18) dans une chambre en aval dudit ensemble ajutage (12). Un détecteur (24) est en communication fluidique avec la chambre (22) afin de détecter l'état fluidique de ladite chambre (22) et fournit une indication de la qualité de l'orifice d'ajutage (18). Une partie (33) permet d'aligner l'orientation du jet de fluide (20) par rapport à la pièce travaillée à partir de l'indication de la qualité du jet de fluide (20).Device (10) comprising a nozzle assembly (12) consisting of a nozzle orifice (18). A source of highly pressurized fluid is in fluid communication with the nozzle orifice (18), a jet of fluid (20) being expelled by said nozzle orifice (18) in a chamber downstream of said nozzle assembly (12) . A detector (24) is in fluid communication with the chamber (22) to detect the fluid state of said chamber (22) and provides an indication of the quality of the nozzle orifice (18). A part (33) makes it possible to align the orientation of the fluid jet (20) relative to the workpiece from the indication of the quality of the fluid jet (20).

Description

INTEGRITY SENSOR FOR FLUID JET NOZZLE
BACKGROUND OF THE INVENTION
This invention relates generally to fluid jet nozzles and more particularly to a flow sensor located in a chamber downstream of the orifice to sense the flow characteristics of the fluid jet, and the condition of the nozzle orifice.
In fluid jet cutters and cleaners, the condition of the nozzle assembly makes a considerable difference in the quality of fluid jet being produced. The more coherent the stream, in general, the more effective and efficient will be the cutting ability of the stream.
Previously, many different ways were used to monitor the condition of the nozzle. These include visual inspection of the fluid jet stream, measuring the vibrational frequency of the fluid jet, monitoring the noise produced by the fluid jet and measuring the dimensions of the cut and surface finish of the surface cut left by the fluid jet. These methods are often imprecise, expensive or left open to operator skill and opinion.
Other ways to monitor the condition of the nozzle include direct inspection of the nozzle orifice and measuring the weight of the nozzle structure. In order to implement the these systems, the fluid jet has to be stopped and the nozzle removed. Also, considerable damage can be done to the parts being cut prior to discovery of the defective orifice.
Abrasive fluid jet cutters and cleaners are an especially difficult to monitor since the flow characteristics of the fluid jet downstream of the funnel tube can be affected not only by the condition of the orifice and specifics of the fluid jet adjacent the orifice, but also by the configuration and dimensions of the chamber and funnel tube and the type and amount of abrasives being used. Monitoring whether the fluid jet is within permissible limits and causes of the flow abnormalities in the fluid jet is therefore difficult.
The foregoing illustrates limitations known to exist in present fluid jet cutter and cleaning systems. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing an apparatus which includes a nozzle assembly having a nozzle orifice formed therein. A highly pressurized fluid source is in fluid communication with the nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly. A sensor is in fluid communication with the chamber for sensing the fluid condition in said chamber which provides an indication of the quality of the nozzle orifice.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures. BRIEF DESCRIPTION OF THE DRAWING FIGURES
Fig. 1 is side cross sectional view illustrating an embodiment of non - abrasive fluid jet nozzle apparatus including a sensor of the present invention;
Fig. 2 is a side cross sectional view illustrating an alternate embodiment of abrasive fluid jet nozzle apparatus including a plurality of sensors of the present invention;
Fig. 3 is a side cross sectional view illustrating yet another alternate embodiment of fluid jet nozzle apparatus with sensor, including alignment means to align the position of the fluid jet nozzle apparatus relative to the workpiece; and
Fig. 4 is a side cross sectional view illustrating a final embodiment of fluid jet nozzle apparatus with sensor, including alignment means to align the position of the workpiece relative to the fluid jet nozzle apparatus.
DETAILED DESCRIPTION
In this disclosure, elements from different embodiments which perform identical functions will be provided with identical reference characters.
Fig. 1 illustrates a fluid jet nozzle apparatus 10. The fluid jet nozzle apparatus 10 includes a nozzle assembly 12, a nozzle tube 14 and a nozzle nut 16. The nozzle assembly 12 has a nozzle orifice 18 formed therein as is well known in the art.
The nozzle tube 14 is in fluid communication with the nozzle orifice 18, wherein a fluid jet 20 is produced downstream of the nozzle assembly 12 into a chamber 22. A sensor 24 is in fluid communication with the chamber 22.
Many factors affect the shape and properties of the fluid jet 20. These factors include the condition and configuration of the nozzle orifice 18, as well as fluid pressure applied within the nozzle tube 14. The cutting effectiveness and precision of the cut are affected by the condition of the fluid jet 20. Therefore it is highly desirable to continually monitor the condition of the fluid jet 20 in fluid jet cutting and cleaning applications.
Either a flow meter 25 or a pressure sensor 27 may be used as a sensor 24 in the present application. Both types of sensors provide reliable indication to the condition of the fluid jet 20. It may be desired to provide both a pressure sensor 27 and a flow meter 25. Especially in situations where the sensor is monitored by a computer, an acceptable value for the pressure indicated by the pressure sensor 27 can be within a preset range for a specified range indicated by the flow meter 25, or vice versa.
Sensors of this type may be applied to either non-abrasive fluid jet cutting applications, as illustrated in Fig. 1, or to abrasive fluid jet cutting applications as illustrated in Fig. 2. In Fig. 2, an abrasive inlet means 26 is in fluid communication with the chamber 22. A funnel tube 28 is located downstream of the chamber 22, and is coaxial with the fluid jet 20. One or more control valves 30 may be applied to control the fluid flow abrasive inlet means 26 or sensor 24. Using the control valves 30, the sensor 24 and the abrasive inlet means 26 may be applied as desired. For abrasive fluid jet cutting applications, there exists an optimum abrasive feeding rate which depends upon the operational parameters of the fluid jet cutter (the relevant parameters include the size of the nozzle orifice 18, the size of the funnel tube 28, the fluid pressure and the type and size of abrasives added to the fluid.
All of the above parameters remain unchanged during most cutting applications except the size of the nozzle orifice 18 and the size of the funnel tube 28. These two sizes change because of wear. Therefore, the optimal abrasive feeding rate must be changed during the cutting process, and this wear can be monitored by indicated changes indicated by the sensor 24. Response to the changes in the sensor can be responded to by either automatic or manual alterations of the abrasive feed rate.
Since the wear of the funnel tube 28 is monitored by sensor 24, the present invention provides the operator with a reliable and quantitative indication of whether the funnel tube 28 meets acceptable standards. In the prior art, the operator has to continually observe the fluid jet stream and using non-quantitative standards and determine when the nozzle fell below the desired standards. The prior art requires a skilled operator to function properly.
Yet another application in abrasive fluid jet cutting is the detection of the clogging of the funnel tube 28 during the cutting process by injected garnet particles of large dimensions. This clogging quickly becomes apparent by the sensor 24 indications.
The sensor 24 may range in complexity from a visual sensor which has to be observed by the operator to one which sends signals to a microprocessor 32. The microprocessor can be used to stop application of fluid to the nozzle tube 14 when the quality of the fluid stream goes below a preset limit.
The information from the microprocessor can even be input into an alignment means 33. This assumes that when the quality of the fluid jet decreases, the stream will become wider, and the cutting kerf 34 (width of a workpiece 36 which is cut by the fluid jet 20) will widen.
It follows that for a given indication from the sensor 24, the cutting kerf should have a given dimension. Therefore, the adjustment means can reposition the orientation of the fluid jet nozzle apparatus 10 relative to the workpiece to compensate for the increase in dimension of the fluid jet. It is to be understood that the adjustment means can reposition either the fluid jet nozzle apparatus 10 (see Fig. 3) or the workpiece 36 (see Fig. 4).
While this invention has been illustrated and described in accordance with a preferred embodiment, it is recognized that other variations and changes may be made therein without departing from the invention as set forth in the claims.

Claims

Having described the invention, what is claimed is:
1. An apparatus comprising: a nozzle assembly having a nozzle orifice formed therein; a highly pressurized fluid source in fluid communication with said nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly; a sensor means in fluid communication with the chamber, for sensing the fluid condition in said chamber which provides an indication of the quality of the nozzle orifice.
2. The apparatus as described in claim 1, wherein the sensor is a fluid pressure sensor.
3. The apparatus as described in claim 1, wherein the sensor is a fluid flow meter.
4. The apparatus as described in claim 1, wherein the sensor is both a fluid pressure sensor and a fluid flow meter.
5. The apparatus as described in claim 1, further comprising abrasive inlet means for introducing abrasive material into the chamber wherein the sensor means is in fluid communication with the abrasive inlet means.
6. The apparatus as described in claim 1, further comprising an abrasive inlet in fluid communication with the chamber, wherein the sensor means is in fluid communication with the abrasive inlet.
7. An apparatus comprising: a nozzle assembly having a nozzle orifice formed therein; a highly pressurized fluid source in fluid communication with said nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly; a sensor means in fluid communication with the chamber, for sensing the fluid condition in said chamber which provides an indication of the quality of the fluid jet.
8. The apparatus as described in claim 7, further comprising: alignment means for aligning the orientation of the fluid jet relative to the workpiece based upon said indication of the quality of the fluid jet.
9. The apparatus as described in claim 7, wherein the sensor is a fluid pressure sensor.
10. The apparatus as described in claim 7, wherein the sensor is a fluid flow meter.
11. The apparatus as described in claim 7, wherein the sensor is a combined fluid pressure sensor and a fluid flow meter.
12. The apparatus as described in claim 7, further comprising abrasive inlet means for introducing abrasive material into the chamber wherein the sensor means is in fluid communication with the abrasive inlet means.
13. The apparatus as described in claim 7, further comprising an abrasive inlet in fluid communication with the chamber, wherein the sensor means is in fluid communication with the abrasive inlet.
14 . An apparatus comprising: a nozzle assembly having a nozzle orifice formed therein; a highly pressurized fluid source in fluid communication with said nozzle orifice, wherein a fluid jet is discharged through the nozzle orifice into a chamber downstream of said nozzle assembly; a sensor in fluid communication with the chamber; alignment means for aligning the orientation of the fluid jet relative toe the workpiece based upon indication of the quality of the fluid jet.
15. The apparatus as described in claim 14, further comprising: alignment means for aligning the orientation of the fluid jet based upon said indication of the quality of the fluid jet.
16. The apparatus as described in claim 14, wherein the sensor is a fluid pressure sensor.
17. The apparatus as described in claim 14, wherein the sensor is a fluid flow meter.
18. The apparatus as described in claim 14, wherein the sensor is a combined fluid pressure sensor and a fluid flow meter.
19. The apparatus as described in claim 14, further comprising abrasive inlet means for introducing abrasive material into the chamber wherein the sensor means is in fluid communication with the abrasive inlet means.
20. The apparatus as described in claim 14, further comprising an abrasive inlet in fluid communication with the chamber, wherein the sensor means is in fluid communication with the abrasive inlet.
EP92915282A 1991-05-17 1992-05-15 Integrity sensor for fluid jet nozzle Expired - Lifetime EP0539581B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US70199791A 1991-05-17 1991-05-17
US701997 1991-05-17
PCT/US1992/004143 WO1992020456A1 (en) 1991-05-17 1992-05-15 Integrity sensor for fluid jet nozzle

Publications (2)

Publication Number Publication Date
EP0539581A1 true EP0539581A1 (en) 1993-05-05
EP0539581B1 EP0539581B1 (en) 1996-03-27

Family

ID=24819482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92915282A Expired - Lifetime EP0539581B1 (en) 1991-05-17 1992-05-15 Integrity sensor for fluid jet nozzle

Country Status (5)

Country Link
EP (1) EP0539581B1 (en)
JP (1) JPH06503761A (en)
DE (1) DE69209436T2 (en)
ES (1) ES2085629T3 (en)
WO (1) WO1992020456A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637027A (en) * 1993-12-23 1997-06-10 Hughes Aircraft Company CO2 jet spray system employing a thermal CO2 snow plume sensor
WO2004076075A1 (en) * 2003-02-27 2004-09-10 Nordson Corporation Flow detection in liquid application systems
US11724361B2 (en) 2017-06-23 2023-08-15 Flow International Corporation Autonomous modification of waterjet cutting systems
BE1025457B1 (en) * 2017-08-08 2019-03-11 D.E.C.O. Nv Water jet device and method for detecting an incision
LU101065B1 (en) * 2018-12-21 2020-06-24 Univ Luxembourg Machining system and monitoring method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520566A (en) * 1947-02-19 1950-08-29 Sargrove Electronics Ltd Grit blasting apparatus and the like
US4420957A (en) * 1981-10-26 1983-12-20 Progressive Blasting Systems, Inc. Monitor method and apparatus for particle blasting equipment
AT380422B (en) * 1984-04-25 1986-05-26 Ver Edelstahlwerke Ag LIQUID JET CUTTER

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9220456A1 *

Also Published As

Publication number Publication date
WO1992020456A1 (en) 1992-11-26
ES2085629T3 (en) 1996-06-01
EP0539581B1 (en) 1996-03-27
JPH06503761A (en) 1994-04-28
DE69209436T2 (en) 1996-08-14
DE69209436D1 (en) 1996-05-02

Similar Documents

Publication Publication Date Title
US5232155A (en) Integrity sensor for fluid jet nozzle
DE69634672T2 (en) System for blasting with grinding fluid
US5407379A (en) Differential pressure metering and dispensing system for abrasive media
EP2321093B1 (en) Vented cutting head body for abrasive jet system
EP0170369B1 (en) Method and apparatus for controlling the cutting of an object
US9586306B2 (en) Method and apparatus for monitoring particle laden pneumatic abrasive flow in an abrasive fluid jet cutting system
JP2903249B2 (en) Cutting head for water jet type cutting equipment
EP1702734B1 (en) Method and apparatus for fluid jet formation
US4844047A (en) Process for sawing crystal rods or blocks into thin wafers
CA2051616C (en) Nozzle for spray tubes
WO1995006526A1 (en) Cleaning method and apparatus utilizing sodium bicarbonate particles
JP2010206167A (en) Method of injecting cmp slurry
US4587772A (en) Dispenser for a jet of liquid bearing particulate abrasive material
US10744620B2 (en) Air flow management systems and methods to facilitate the delivery of abrasives to an abrasive fluid jet cutting head
US3568377A (en) Device for cooling and cleaning of grinding wheels
EP0539581A1 (en) Integrity sensor for fluid jet nozzle.
CA3017152A1 (en) Strainer device for wash water used with equipment in the aggregate and mining industries
US5401205A (en) Media control valve
US5542873A (en) Novel media valve
US3752400A (en) Combined spray and anti-clogging means
EP0022444B1 (en) Improvements in and relating to the detection of particles in a gaseous medium
US5460025A (en) Shot peening method
GB2333836A (en) Particle size distribution dilution
AU713995B2 (en) Subsea wellhead mechanical erosion detector
KR0123470Y1 (en) Cutting device of semiconductor wafer

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930204

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT NL

17Q First examination report despatched

Effective date: 19940608

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT NL

ITF It: translation for a ep patent filed

Owner name: ING. A. GIAMBROCONO & C. S.R.L.

REF Corresponds to:

Ref document number: 69209436

Country of ref document: DE

Date of ref document: 19960502

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2085629

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19970424

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970425

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19970516

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19980516

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980515

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19981201

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20000301

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030520

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030626

Year of fee payment: 12

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Ref country code: FR

Ref legal event code: CD

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050515