GB2222392A - Fuel pump reservoir assembly - Google Patents

Fuel pump reservoir assembly Download PDF

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Publication number
GB2222392A
GB2222392A GB8821886A GB8821886A GB2222392A GB 2222392 A GB2222392 A GB 2222392A GB 8821886 A GB8821886 A GB 8821886A GB 8821886 A GB8821886 A GB 8821886A GB 2222392 A GB2222392 A GB 2222392A
Authority
GB
United Kingdom
Prior art keywords
fuel
reservoir
assembly
pot
fuel pump
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
GB8821886A
Other versions
GB8821886D0 (en
GB2222392B (en
Inventor
Thomas Christopher Wainwright
Neale Jones
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.)
Delco Electronics Overseas Corp
Original Assignee
Delco Electronics Overseas Corp
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 Delco Electronics Overseas Corp filed Critical Delco Electronics Overseas Corp
Priority to GB8821886A priority Critical patent/GB2222392B/en
Publication of GB8821886D0 publication Critical patent/GB8821886D0/en
Priority to DE19893927687 priority patent/DE3927687C2/en
Priority to FR8911500A priority patent/FR2636017B1/en
Publication of GB2222392A publication Critical patent/GB2222392A/en
Application granted granted Critical
Publication of GB2222392B publication Critical patent/GB2222392B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/077—Fuel tanks with means modifying or controlling distribution or motion of fuel, e.g. to prevent noise, surge, splash or fuel starvation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/06—Fuel tanks characterised by fuel reserve systems
    • B60K15/061—Fuel tanks characterised by fuel reserve systems with level control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03105—Fuel tanks with supplementary interior tanks inside the fuel tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
    • B60K2015/03453—Arrangements or special measures related to fuel tanks or fuel handling for fixing or mounting parts of the fuel tank together
    • B60K2015/03467—Arrangements or special measures related to fuel tanks or fuel handling for fixing or mounting parts of the fuel tank together by clip or snap fit fittings

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

12,,- 2 3 9 FUEL PU.'.:P RE-------EV011E ASSEMEl-Y Tnis invention relates
to a uel Dump reservoir assembly for a fuel pump associateu-3- with the fuel tank of a motor vehicle.
Known fuel pump reservoir assemblies include aspirator assemblies (also referred to as jet -ioned bet ret rn pump assemblies) posit Ulween a fuel Uu.
1 T Line and a reservoir pot. Ihese known aspirator assemblies however do not prevent the flow of fuel t L.herethrough from the reservoir pot to the fuel tank, and there-fore do not maintain a predetermined level of fuell in the reservoir pot. Further, these known fuel pump reservoir assemblies do not allow for variations in the separation of the upper and lower walls of the fuel tank. These are particular -ages when the fuel level in the fuel tank is disadvant. low as they may result in air being pu,,Ppe,-,' by the fuel pump.
It is an ob4ect of the --resent invention to overcome the above mentioned disavantages.
To this end, a fuel pump reservoir assembly in accordance with the present invention comprisie3 a reservoir po-I for maintainin,,-, a predetermined leve-of fuel therein and engageable with a lower wall of "uel - -Dut line for o be the fuel tank; a fuel out pumped from the reservoir Dot; a fuel return line for the return of excess fuel to the reservoir pot; a --ing bracket attachable to an upper wall of the m o u r. fuel tank; atu least one mounting Dost positioned between the mounting bracket and the reservoir pot, C) --fng post being movable relative to the the mountmounting bracket and/or the'reservoir post in a direotion parallel to the long'--.udinal axis of the mour.-,-Inr- post or posts; a spring associated with the flie -he or each mounting post to res ntly bias IV b.-a---',cet and the reservoJ L mount- A i-r Do' away one another, and to substantially maintain the reservoir pot in contact with the 'Lower wall of th- Luel ank when in use; and an aspirator assembly connect--- between the fuel return line and the reservoir pot and positionable adjacent to.the lower wall of the fuel tank, the aspirator assembly allowing flow of fuel therethrough frorr the fuel return line and the fuel tank to the reservoir Dot, but preventing flow of fuel therethrough from, the reservoir poll, to the fuel tank, to maintain the predetermined level of f L, 1 fuel in the reservoir DOt.
L, A.
Preferably, a fuel DUMD is mounted inside the reservo-Lr pot to PUMP fUel from the reservoir pot through the fuel output line. In this case, the fuel pump is preferably mounted on one or more vibration daMDers Dositioned in the bottom of the reservoir pot. Elnere two or More vibration dampers are use-Al, t bhe vibration damDers are preferably arcuate an-: of rubber material. in this case, the vibration dampers are preferably pos- 2tioned in correspondingly shaped -om. o slots in the bott ' the reservoir Do- Preferably the slots are defined b-, 1Dsltjandlncz walls in the reservo-i-- Dot which are 'Lor-ie,:.4 inte=ra'",-.- with the reservoir pot. A sheet of plastics mate.rial is prefeerably positioned between the vibration da.,nDer or dampers and the fuel Dump.
Alternat.ively, the fuel pump may be positioned outside the reservoir pot to draw fuel from the reservoir pot through the fuel output line.
Preferably a vaDOU-1 separation -filter is positioned in the reservoir pot.
The asDirator assembly preferably comprises a housing and a valve assembly. The housing is Dreferablv of Dlastics malverilal and is formed -1n one f' piece. Preerably, in this case, the housing makes a -^4 1- a corresDondin:., oneninr- in sna- l_t he reservoir C - W po A sealing ring is preferably pos lioned be'.
the aspirator assembly and the reservoir pot to 4- bially p. Lhe an'.
subst. 1 revent leakage of fuel between C> fuel tank and the reservoir pot other than through the aspirator assembly.
Preferably a fuel level sensor is mounted on the fuel pump reservoir assembly for monitoring the level of fuel in the fuel tank.
The present invention will now be described, by way of example, With reference to the accompanying drawings, in which:- Figure 1 is a side view of a fuel pump reservoir assembly in accordance w:th the present invention; Figure 2 is a side view from L-he opposite sd- shown in Fgure 1; Figure 3 is a partial cross-sectional.,4Lew -he aspirator assembly of Figure 1; 2 C f t Figure 2,' is a --ross-secIi-,"onal view of the lower po:,-.-!on of the reservoir pot of Figure 'L on the line in Figure 1; Fi-ur---- is a -ou view in the directLon of arrow in Figure 4; and a Figures 6 and 7 are top and side views o vibration damper used in the fuel pump reservoir assembly of Figure 1.
Referring to Figures 1 and 2, there is shown a fuel pump reservoir assembly 10 comprising a reservoir pot, 11, a fuel output line 12, a fuel return line 1-4, a mounting'bracket 15, and an J_ -he mounting bracket aspirator assembl. 16. In use, 4. U 1 L, I's secureed to the upper wall of a fuel tank (not shown", w4-h the lower wall 17 of the reservoir Dol- -L U - L, 2C 11 resting on the lower wall of the fuel tank. Positioned between the mounting bracket 15 and the reservoir pot 11 are two or three mounting posts 18 which can move. relative to the mounting bracket and/or the reservoir pot, in the longitudinal direction X. Helical springs 19 (other suitable springs may be used) around each mounting post 18 resiliently bias the mounting bracket 15 and the reservoir poz 11 away from one another to ensure the lower wall 17 of the reservoir pot remains resting on the lower wall of the fuel tank. This arrangement has particular advantage when the fuel pump reservoir assembly 10 is used with a plastics fuel tank because the lower wall of such fuel tanks tends to sag when the fuel tank is full and then rises as the fuel tank empties, and can also move due to thermal variations. The present arrangement ensures that the lower wall 17 of the reservoir pot 11 remains in contact with the lower wall of the fuel tank at all times.
The reservoir pot 11 comprises a lid 90 which is attached by snap fittings 91 to a cup-shaped lower portion 92. The reservoir pot 11 maintains a predetermined A7el of fuel therein. The lid 90 anJ the lower portion 92 are preferably of plastics material.
Me fuel pump reservoir assembly 10 includes a fuel level sensor 20 which comprises a float 21 which can rest on the surface of fuel in the fuel tank; an arm 22 which is attached to a rotatable pin 23 at one end to pivot about the longitudinal axis of the rotatable pin, and which is attached at its free end to the float; End a circuit housing 24 on which the rotatable pin is mounted. Mounted inside the circuit housing 24 is an electrical monitoring circuit (not shown) which monitors the rotational position of the rotatable pin 23 (which provides an indication of fuel level in the fuel tankj and sends a signal via electric lines (not shown) to a fuel level gauge (not shown). This arrangement of electrical monitoring circuit is well known in the art. and will not be described in detail.
A fuel pump (not shown) is positioned inside the reservoir pot 11 and pumps fuel from the reservoir pot to a fuel injector or a carburettor ' associated with an engine (not shown) by way of the fuel output line 12. As an alternative, the fuel pump may be positioned outside the fuel tank, and may draw fuel from the reservoir pot 11 by way of the fuel output line 12. Excess or unused fuel is returned to the reservoir pot 11 by way of the fuel return line 14 and the aspirator assembly 16 (which will be described in more detail hereinafter).
The fuel pump is mounted within the reser7oir pot 11 on two vibration dampers 25 (Figures 6 and 7) which are preferably arcuate in shape and preferably made of synthetic rubber. The vibration dampers 25 are positioned in correspondingly shaped slots 26 (Figures 4 and 5) defined by upstaniinj walls 27 attached to the inner surface 28 lower wall 17 of the reservoir pot 11. The upstanding walls 27 are preferably formed integrally with the lower portion 92 of the reservoir pot 11. A sheet of plastics material may be positioned between the vibration dampers 25 and the fuel pump. The vibration dampers 25 help to deaden any noise generated by the fuel pump.
A vapour separatibn filter (not shown) may be positioned in the reservoir pot 11. Such a filter assists in separating any vapour in the fuel in the reservoir pot 11 from the fuel, to substantially 1 prevent vapour being pumpedd to the engine by the fuel -age where pump. This arrangement has par-.icu.1ia,- advant - assembly 10 is used in high the fuel pump reservo i temperature conditions where vapour can be easily generated in the fuel.
The aspirator assembly 16 is positioned adjacent the 'Lower wall 1-7 of the reservoir Dot 11, and hence, when in use, adjacent the lower wall of the fuel tank. The aspirator assembly 16, which is shown in more detail in Figure 3, comprises a housing 30, which is preferably formed in one piece from plastics material, and a valve assembly 31. The housing 30 comprises an input passage 32, an output passage 33, and a chamber 34 connected therebetween.
The input passage 32 is connected to the fuel return line 14, and the output passage 33 is connected to "'he output passage 33 the reservoir pot 11. L has a fre-e end 35 which is shaped to make a sna- fit in an corresponding pot open'nz 36 (Figure 4) Jin 'L.-,he lower portion 92 of the reservoir Dot. 11.
Prom Excess or unused fuel- -flows Lhe fuel return line 14 through the input passacre 32 to the output passage 33 and into the reservoir Dot 11. The output, Dassaze has an annular c-roove 45 therein in which is J C D0Sitioned a sealing rinc. in the form of an O-rin:- h:"
W W W_ _lj - material. 'itting of the of fuel resistant On f aspirator assembly 16 to the reservoir pot 11, the O-ring 45 provides a seall between the aspirator C) assembly 16 and the reservoir pot 11, to prevent fuel 1 - leaking into the reservoir pot 11 from the fuel tank around the OUtpUt, Dassage 33.
The valve assemb15 31, L which is preferably -ics material, is positioned in an opening 37 of plast in the lower portion of the chamber 3-111. r-"he valve assemblY 31 comprises a valve disc 38, a valve seat 39, and a plate 40 having apertures 41 therein. The valve seat 39 is positioned between the valve disc 3E and the plate 40 and surrounds the apertures 41. The valve disc 38 is movable relative to the valve seat 39 to open and close the apertures 41. The plate 40 is mounted in the opening 37 of the chamber 34, with the valve disc 38 and valve seat 39 positioned in the chamber.
A flow restrictor 42 is positioned in the chamber 34 at the exit of the input passage 32, and adjacent the entry to the output passage 33. As fuel flows from the input passage 32 to the output passage 33, pressure is built up in the fuel by the fuel restrictor 42. This generates a lower pressure in the chamber 34 than in the fuel tank. As a consequence, fuel in the fuel tank lifts the valve disc 38 off the valve seat 39 to open the apertures 41, and fuel enters the chamber 34 from zhe fuel tank and passes through the output passage 33 into the reservoir pot 11 to maintain the predetermined level of fuel therein. When pressure equilibrium is reached, the valve disc 38 moves back into enagagement with the valve seat 39 to close the apertures 41. This prevents fuel flowing back from the reservoir pet 11 thrDugh the aspirator assembly 1E to the fuel tank.
This arrangement has the advantage of maintaining a predetermined level of fuel in the reservoir pot 11 even when the level of fuel in the fuel tank is low.
Attention is drawn to our co-pending GB patent application no. (Ref: MD/449) filed the same day as the present application.
-I-

Claims (15)

Claims: -
1. A fuel pump reservoir assembly for mounting in a fuel tank, the fuel pump reservoir assembly comprising a reservoir pot for maintaining predetermined level of fuel therein and engageable with a lower wall of the fuel tank; a fuel output line for fuel to be pumped from the reservoir pot; a fuel return line for the return of excess fuel to the reservoir pot; a mounting bracket attachable to an upper wall of the fuel tank; at least one mounting post positioned between the mounting bracket and the reservoir pot, the mounting post being movable relative to the mounting bracket and/or the reservoir post in a direction parallel to the longitudinal axis of the mounting post or posts; a spring associated with the or each mounting post to resiliently bias the mounting bracket and the reservoir pot away from one another, and to substantially maintain the reservoir pot in contact with the lower wall of the fuel nank when in use; and an aspirator assembly conneated between the fuel return line and the reservoir pot and positionable adjacent to the lower wall of the fuel tank, the aspirator assembly allowfng flow of fuel therethrough from the fuel return line and the fuel tank to the reservoir pot, but preventing flow of fuel therethrough from the reservoir pot to the fuel tank, to maintain the predetermined level of fuel in the reservoir p-ot.
2. A fuel pump reservoir assembly as claimed in claim 1, wherein a fuel pump is mounted inside the reservoir pot A pump fuel from the reservoir pot through the fuel output line.
3. A fuel pump reservoir assembly as claimed in claim 2, wherein the fuel pump is mounted 11 M -C- on one or more vibration dampers positioned in the bottom of the reservoir pot.
4. A fuel pump reservoir assembly as claimed in claim 3, comprising two or more vibration dampers, wherein the vibration dampers are arcuate and of rubber material.
5. A fuel pump reservoir assembly as claimed in claim 4, wherein the vibration dampers are positioned in correspondingly shaped slots in the bottom of the reservoir pot.
6. A fuel pump reservoir assembly as claimed in claim 5, wherein the slots are defined by upstanding walls in the reservoir pot which are formed integrally with the reservoir pot.
7. A fuel pump reservoir assembly as claimed in any one of claims 2 to 6, wherein a sheet of plastics material is positioned between the vibration damper or dampers and the fuel pump.
8. A fuel pump reservoir assembly as 2G claimed in claim 1, wherein a fuel pump is positioned outside the reservoir pot and draws fuel from the reservoir pot through the fuel output line.
9. A fuel pump reservoir assembly as claimei in any one of claims 1 zo 8, wherein a vapour separation filter is positioned in the reservoir pot.
10. A fuel pump reservoir assembly as claimed in any one of claims 1 to 9, wherein the aspirator assembly comprises a housing and a valve assembly.
11. A fuel pump reservoir assembly as claimed in claim 10. wherein the housing is of plastics material and is firmed in one piece.
12. A fuel pump reservoir assembly as claimed in claim 11, wherein the housing makes a snap fit in a corresponding opening in the reservoir pot.
i cl- 1-. A fue-' pump reservoir assembly as claimed in any one of claims 10 to 12, wherein a -ween the aspirator sealing POSi.ioned bet assembly and the reservoir pot to substant.Lally - leakage o-^ fuel between the fuel tank and the prevent L L.1 C) reservoir pot other than through the aspirator assembly.
14. A fuel PUMD reservoir assembly as claimed in any one of claims 1 to 13, wherein a fue 10 levell sensor is mounted thereon for monitoring the " fuel in the fuel tank when in use.
level oL L
15. A fuel pump reservoir assembly subs--ant.!La--&-l,- as he-einbefore described with reference to, and as shown in, the accom-oan,,,,J-ng 15 drawings.
0 1 i PublUhedl99O at The Patent Office. State House. 66 7tFighHo3burn. LondonWClR4TP Further copies maybe 0btLjnedfroMTh0P&tentOMc6Sales Branch. St Mary Cray, Orpington, Kant -61RS 3RD. Printed by Multiplex techniques ltd. St Mary Cray. Kent. Con- 1.187 I Z.
GB8821886A 1988-09-03 1988-09-03 Fuel pump reservoir assembly Expired - Fee Related GB2222392B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8821886A GB2222392B (en) 1988-09-03 1988-09-03 Fuel pump reservoir assembly
DE19893927687 DE3927687C2 (en) 1988-09-03 1989-08-22 Fuel pump tank arrangement
FR8911500A FR2636017B1 (en) 1988-09-03 1989-09-01 FUEL PUMP RESERVE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8821886A GB2222392B (en) 1988-09-03 1988-09-03 Fuel pump reservoir assembly

Publications (3)

Publication Number Publication Date
GB8821886D0 GB8821886D0 (en) 1988-10-19
GB2222392A true GB2222392A (en) 1990-03-07
GB2222392B GB2222392B (en) 1990-09-05

Family

ID=10643807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8821886A Expired - Fee Related GB2222392B (en) 1988-09-03 1988-09-03 Fuel pump reservoir assembly

Country Status (3)

Country Link
DE (1) DE3927687C2 (en)
FR (1) FR2636017B1 (en)
GB (1) GB2222392B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238040A1 (en) * 1992-11-11 1994-05-19 Vdo Schindling Suction jet pump for pumping fuel
FR2719629B1 (en) * 1994-05-05 1996-07-26 Marwal Systems Fuel suction / gauging device for a motor vehicle.
DE19613893A1 (en) * 1996-04-06 1997-10-09 Bayerische Motoren Werke Ag Fuel tanks for vehicles
DE19833130A1 (en) * 1998-07-23 2000-01-27 Bosch Gmbh Robert Apparatus for conveying fuel from a storage container to an I.C. engine has an opening on a level above the base of a section to form a storage chamber

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2602234B1 (en) * 1976-01-22 1977-04-28 Opel Adam Ag Fuel tank with a storage pot
DE3018242A1 (en) * 1980-05-13 1981-11-19 Alois 4040 Neuss Ferch Fuel pipe connection for one piece plastics fuel tank - has opening in tank wall made into union with socket holding fuel line positioned inside
DE3311377A1 (en) * 1983-03-29 1984-10-04 Audi Nsu Auto Union Ag, 7107 Neckarsulm LIQUID CONTAINERS, IN PARTICULAR FUEL CONTAINERS FOR MOTOR VEHICLES
DE3510890A1 (en) * 1985-03-26 1986-10-09 Pierburg Gmbh & Co Kg, 4040 Neuss FUEL DELIVERY SYSTEM
DE3565075D1 (en) * 1985-05-25 1988-10-27 Fiat Auto Spa System for fixing the fuel pump in the fuel tank
DE3887263T2 (en) * 1987-10-26 1994-05-19 Nippon Denso Co Fuel supply device for vehicles.

Also Published As

Publication number Publication date
DE3927687C2 (en) 1994-06-01
GB8821886D0 (en) 1988-10-19
DE3927687A1 (en) 1990-03-15
GB2222392B (en) 1990-09-05
FR2636017A1 (en) 1990-03-09
FR2636017B1 (en) 1995-07-13

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970903