CN110529521A - A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston - Google Patents
A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston Download PDFInfo
- Publication number
- CN110529521A CN110529521A CN201910702383.XA CN201910702383A CN110529521A CN 110529521 A CN110529521 A CN 110529521A CN 201910702383 A CN201910702383 A CN 201910702383A CN 110529521 A CN110529521 A CN 110529521A
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- CN
- China
- Prior art keywords
- brake
- piston
- clamp body
- braking clamp
- hydraulic
- 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.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
- F16D65/095—Pivots or supporting members therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Braking Arrangements (AREA)
Abstract
A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston, including brake holder and U-shaped braking clamp body；Set that there are two be arranged side by side and cavity space independent hydraulic cylinder mutually on braking clamp body one end, piston is respectively equipped in two hydraulic cylinders, the oil inlet of two hydraulic cylinders passes through oil inlet pipe respectively and is connected with hydraulic control valve, and sealing ring is equipped between piston and hydraulic cylinder；Braking clamp body one end is equipped with the movable brake block that sliding is pushed by piston, movable brake block both ends are supported in brake holder respectively freely slidablely, fixed brake block on the braking clamp body other end, the two sides of braking clamp body are respectively equipped with wing plate, wing plate is equipped with guide pin, and guide pin is interspersed in freely slidablely on the pilot hole in brake holder.The present invention has ensured that the brake fluid pressure pressure in braking in high-speed rotating brake disc on double-piston is consistent, avoids the occurrence of due to the even brake fade of the excessive noise and vibration of hydraulic bring not of uniform size.
Description
Technical field
The present invention relates to disc brake fields, and in particular to a kind of independent hydraulically controlled distribution type floating caliper type disc of automobile double-piston
Brake.
Background technique
So that the car deceleration in traveling is even stopped, makes the speed of the automobile of descent run keep stablizing, and make to have stopped
The automobile sailed remains stationary, these effects are referred to as automobile brake.
Although disc brake with fixed caliper also has double-piston, its braking clamp body is mounted in vehicle bridge, can neither be rotated also not
It can be moved along brake disc axis direction, it is necessary to which additional installing brake actuation device makes brake block press to brake disc, determines caliper disc
Brake disadvantage: structure is complicated for 1. calipers；The brake disc two sides 2. oil cylinder is placed in, it is necessary to the pincers inner oil tube for crossing over brake disc
Or external oil pipe connection；3. thermic load is big, oil cylinder is especially outer side cylinder and is easy across the brake fluid in oil pipe by hot vapour
Change.
Using practice proves, disc brake with floating caliper due to simple and compact for structure and be easily installed, by more and more by
Using.But traditional floating disc brake is mostly the brake of the single oil cylinder of single-piston, disadvantage is that: 1. for hydraulic
The brake actuation loine pressure of braking system is higher, and brake efficiency is low；2. to obtain good braking effect, braking moment is exported
Increase, size and quality also increase with it, therefore the higher and higher modern vehicle of rate request needs the brake of dimensionally stable
Structure is to carry out better space layout design and aesthetic.
In order to solve traditional single-piston disc brake with floating caliper and the above-mentioned shortcoming of disc brake with fixed caliper, inventor
The numbers of filing an application such as Chen Yonghan are a kind of hydraulic fist type float pincer double-piston disc brake for vehicle of CN200420023574.2,
It is made of the brake support frame being fixed on spindle, and braking clamp body passes through bolt and the guiding being connected with bolt
Pin is fixed on bracket；Piston there are two being set in braking clamp body, and be equipped with by-pass prot and connect two pistons, piston pushes inside
Friction block assembly presses to brake disc, and friction block assembly is equipped with vulcanized rubber plate bloop；Piston be externally provided with rectangular seal and
Piston dust cover is set on braking clamp body there are two guide pin, and plough groove type rubber sleeve is housed on guide pin, outside guide pin
It is equipped with guide pin dust cover.But that in actual application, it is found that above-mentioned patent formula still has following deficiency:
1) two pistons are connected by by-pass prot in braking clamp body, and pressure is difficult to realize unanimously in plunger shaft, and are utilized
By-pass prot carries out being easy to appear braking moment hysteresis phenomenon in torque transfer process, influences timely responding to for brake efficiency；
2) due to being integrated fist formula in braking clamp body plunger shaft, structure is excessively compact, braking clamp body piston under continuous work
Intracavitary to be easy to cause high temperature and pressure, when thermic load is big, brake fluid is easy to appear vaporization in oil cylinder；
3) heat concentrates on braking clamp body when brake work, and amount of localized heat can not disperse in time, and long-term work is easy to lead
Abrasion is caused to influence device longevity；
4) since the motivator being easy to appear on two-piston is inconsistent when two-piston works, it is especially high to influence wheel work
Speed operates the dynamic balancing of lower automobile.
Summary of the invention
Present invention aims to overcome that the shortcomings that prior art and deficiency, provide a kind of independent hydraulically controlled point of automobile double-piston
Distribution type disc brake with floating caliper, it is ensured that brake compensation, and also can under the special operation conditions such as high speed braking, emergency braking
Guarantee that wheel realizes dynamic balancing in braking.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston, including brake holder and U-shaped braking clamp body,
Brake holder is for being fixed on stub axle；It is arranged side by side there are two being set on braking clamp body one end and cavity space is mutual
Mutually independent hydraulic cylinder is respectively equipped with piston in two hydraulic cylinders, and the oil inlet of two hydraulic cylinders passes through oil inlet pipe and liquid respectively
Pressure control valve is connected, and sealing ring is equipped between piston and hydraulic cylinder；Braking clamp body one end, which is equipped with, pushes sliding by piston
Movable brake block, movable brake block both ends are supported in brake holder respectively freely slidablely, solid on the braking clamp body other end
Surely there is the fixation brake block matched with movable brake block, the two sides of braking clamp body are respectively equipped with wing plate, and wing plate is equipped with guiding
Pin, guide pin are interspersed in freely slidablely on the pilot hole in brake holder.
From the foregoing, it will be observed that in the use of the present invention, by brake holder for being fixed on stub axle, with driving
The pedal force that people applies increases, and pedal travel increases, and hydraulic control valve is hydraulic greatly according to the variation adjusting of pedal travel direct proportion
It is small, it is ensured that it is consistent by the hydraulic pressures for being assigned to two pistons, fist formula floating clamp disk double-piston brake is avoided because of effect
The pressure occurred on two-piston is insufficient or even pressure is inconsistent brings excessive noise and vibration, and piston is in hydraulic effect
Under, push movable brake block to brake disc, at the same time, the reaction force acted on braking clamp body then pushes braking clamp body edge
Guide pin to the right, i.e., braking clamp body slides axially along guide pin relative brake device bracket, makes to be fixed on braking clamp body
On fixation brake block press against brake disc, further, at this time work of the brake disc in movable brake block and fixed brake block
Firmly with clamp brake disc under the action of reaction force, be allowed to result from the opposite braking moment of the direction of motion on the disc brake rotor,
It realizes that automobile reaches the purpose of braking, is special brake fluid due to passing energy medium, the process when brake release in hydraulic cylinder
Hydraulic control valve returns to original state.
The present invention is distributed hydraulic on double-piston by hydraulic control valve, has ensured the high-speed rotating brake disc in braking
Brake fluid pressure pressure on upper double-piston is consistent, avoids the occurrence of since hydraulic bring noise and vibration not of uniform size is even braked
Failure, and further, when wherein a piston does not work, controller stablizes another wheel cylinder hydraulic pressure pressure, so that it is guaranteed that system
The stability of dynamic efficiency, bring to a halt or the special operation conditions such as high speed braking under, it is ensured that disc brake with floating caliper still is able to export
The hydraulic pressures for meeting braking moment needs carry out kinetogenesis and realize dynamic balancing.
As an improvement of the present invention, the movable brake block and fixed brake block include friction lining board and are fixed on
Friction block on friction lining board, the friction lining board both ends are supported in brake holder respectively freely slidablely.
As an improvement of the present invention, the hydraulic cylinder is equipped with gas vent, is equipped with exhaust valve at gas vent.
As an improvement of the present invention, the piston is equipped with piston dust cover.
As an improvement of the present invention, the distance between described two hydraulic cylinders are greater than or equal to 3mm.
Compared with prior art, the invention has the following advantages that
The present invention is distributed hydraulic on double-piston by hydraulic control valve, has ensured the high-speed rotating brake disc in braking
Brake fluid pressure pressure on upper double-piston is consistent, avoids the occurrence of since hydraulic bring noise and vibration not of uniform size is even braked
Failure；
And further, when wherein a piston does not work, controller stablizes another wheel cylinder hydraulic pressure pressure, so that it is guaranteed that
The stability of brake efficiency is being brought to a halt or high speed braking etc. is under special operation conditions, it is ensured that disc brake with floating caliper still is able to defeated
The hydraulic pressures for meeting braking moment needs out carry out kinetogenesis and realize dynamic balancing.
Detailed description of the invention
Fig. 1 is the schematic diagram of the independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston of the present invention；
Fig. 2 is the schematic diagram of the present invention movable brake block and fixed brake block；
Fig. 3 is the schematic diagram of inventive piston.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
Embodiment
Please refer to Fig. 1 to Fig. 3, a kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston, including braking branch
Frame 10 and U-shaped braking clamp body 20, brake holder 10 is for being fixed on stub axle；
It is set on 20 one end of braking clamp body there are two being arranged side by side and cavity space independent hydraulic cylinder 21 mutually, two liquid
Piston 22 is respectively equipped in cylinder pressure 21, the oil inlet of two hydraulic cylinders 21 passes through oil inlet pipe 23 respectively and is connected with hydraulic control valve 24
It is logical, sealing ring 29 is equipped between piston 22 and hydraulic cylinder 21；
20 one end of braking clamp body is equipped with the movable brake block 30 that sliding is pushed by piston 22, movable 30 both ends of brake block point
It is not supported in brake holder 10 freely slidablely, is fixed on 20 other end of braking clamp body and is matched with movable brake block 30
Fixation brake block 40, the two sides of braking clamp body 20 are respectively equipped with wing plate 25, and wing plate 25 is equipped with guide pin 26, and guide pin 26 can
It is slidably interspersed on the pilot hole in brake holder 10.
From the foregoing, it will be observed that in the use of the present invention, by brake holder for being fixed on stub axle, with driving
The pedal force that people applies increases, and pedal travel increases, and hydraulic control valve is hydraulic greatly according to the variation adjusting of pedal travel direct proportion
It is small, it is ensured that it is consistent by the hydraulic pressures for being assigned to two pistons, fist formula floating clamp disk double-piston brake is avoided because of effect
The pressure occurred on two-piston is insufficient, and even the inconsistent bring noise and vibration of pressure, piston, will under the action of hydraulic
Movable brake block pushes brake disc to, and at the same time, the reaction force acted on braking clamp body then pushes braking clamp body along leading
To the right to pin, i.e., braking clamp body slides axially along guide pin relative brake device bracket, makes to be fixed on braking clamp body
Fixed brake block presses against brake disc, and further, at this time brake disc is in movable brake block and the active force for fixing brake block
With brake disc is clamped under the action of reaction force, be allowed to result from the opposite braking moment of the direction of motion on the disc brake rotor, realize
Automobile reach braking purpose, due to pass can medium be special brake fluid, when brake release in hydraulic cylinder by hydraulic
Control valve returns to original state.
The present invention is distributed hydraulic on double-piston by hydraulic control valve, has ensured the high-speed rotating brake disc in braking
Brake fluid pressure pressure on upper double-piston is consistent, avoids the occurrence of since hydraulic bring noise and vibration not of uniform size is even braked
Failure, and further, when wherein a piston does not work, hydraulic control valve stablizes another wheel cylinder hydraulic pressure pressure, thus really
The stability for protecting brake efficiency is being brought to a halt or high speed braking etc. is under special operation conditions, it is ensured that disc brake with floating caliper still is able to
The hydraulic pressures that output meets braking moment needs carry out kinetogenesis and realize dynamic balancing.
In the present embodiment, the movable brake block 30 and fixed brake block 40 include that friction lining board 50 and being fixed on rubs
The friction block 60 on liner plate 50 is wiped, 50 both ends of friction lining board are supported on respectively freely slidablely in brake holder 10.
In the present embodiment, the hydraulic cylinder 21 is equipped with gas vent, is equipped with exhaust valve 27 at gas vent, exhaust valve is used for
Discharge gas extra in hydraulic cylinder.
In the present embodiment, the piston 22 is equipped with piston dust cover 28, prevents dust from flying into piston.
In the present embodiment, the distance between described two hydraulic cylinders 21 be greater than or equal to 3mm, in this way it is possible to prevente effectively from
Heat transmitting turbulent flow and braking clamp body position temperature are excessively high.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (5)
1. a kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston, it is characterised in that: including brake holder and U-shaped
Braking clamp body, brake holder is for being fixed on stub axle；Set on braking clamp body one end there are two be arranged side by side and
Cavity space independent hydraulic cylinder mutually is respectively equipped with piston in two hydraulic cylinders, and the oil inlet of two hydraulic cylinders passes through respectively
Oil inlet pipe is connected with hydraulic control valve, and sealing ring is equipped between piston and hydraulic cylinder；Braking clamp body one end is equipped with by piston
The movable brake block of sliding is pushed, movable brake block both ends are supported in brake holder respectively freely slidablely, braking clamp body
The fixation brake block matched with movable brake block is fixed on the other end, the two sides of braking clamp body are respectively equipped with wing plate, wing plate
It is equipped with guide pin, guide pin is interspersed in freely slidablely on the pilot hole in brake holder.
2. the independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston according to claim 1, it is characterised in that: institute
It states movable brake block and fixes the friction block that brake block includes friction lining board and is fixed on friction lining board, the friction lining board
Both ends are supported in brake holder respectively freely slidablely.
3. the independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston according to claim 1, it is characterised in that: institute
It states hydraulic cylinder and is equipped with gas vent, be equipped with exhaust valve at gas vent.
4. the independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston according to claim 1, it is characterised in that: institute
Piston is stated equipped with piston dust cover.
5. the independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston according to claim 1, it is characterised in that: institute
The distance between two hydraulic cylinders are stated more than or equal to 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910702383.XA CN110529521A (en) | 2019-07-31 | 2019-07-31 | A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910702383.XA CN110529521A (en) | 2019-07-31 | 2019-07-31 | A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110529521A true CN110529521A (en) | 2019-12-03 |
Family
ID=68661126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910702383.XA Pending CN110529521A (en) | 2019-07-31 | 2019-07-31 | A kind of independent hydraulically controlled distribution type disc brake with floating caliper of automobile double-piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110529521A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111895009A (en) * | 2020-08-05 | 2020-11-06 | 盐城工学院 | Automobile brake structure |
| CN112013053A (en) * | 2020-09-16 | 2020-12-01 | 辽宁工程技术大学 | Piston structure of caliper cylinder of automobile brake |
| CN113700779A (en) * | 2021-07-05 | 2021-11-26 | 安徽江宏制动器有限公司 | Anti-deformation brake type caliper assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090057641A (en) * | 2007-12-03 | 2009-06-08 | 현대자동차주식회사 | Disk brake |
| CN205423618U (en) * | 2016-04-11 | 2016-08-03 | 许昌学院 | Novel intelligence floating caliper disc brake |
| CN206072179U (en) * | 2016-09-28 | 2017-04-05 | 通天汽车桥（天津）有限公司 | A kind of double-cylinder hydraulic disc brake with floating caliper |
| CN206988333U (en) * | 2017-04-20 | 2018-02-09 | 武汉理工大学 | Automotive disc floating caliper |
-
2019
- 2019-07-31 CN CN201910702383.XA patent/CN110529521A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090057641A (en) * | 2007-12-03 | 2009-06-08 | 현대자동차주식회사 | Disk brake |
| CN205423618U (en) * | 2016-04-11 | 2016-08-03 | 许昌学院 | Novel intelligence floating caliper disc brake |
| CN206072179U (en) * | 2016-09-28 | 2017-04-05 | 通天汽车桥（天津）有限公司 | A kind of double-cylinder hydraulic disc brake with floating caliper |
| CN206988333U (en) * | 2017-04-20 | 2018-02-09 | 武汉理工大学 | Automotive disc floating caliper |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111895009A (en) * | 2020-08-05 | 2020-11-06 | 盐城工学院 | Automobile brake structure |
| CN111895009B (en) * | 2020-08-05 | 2022-02-11 | 盐城工学院 | Automobile brake structure |
| CN112013053A (en) * | 2020-09-16 | 2020-12-01 | 辽宁工程技术大学 | Piston structure of caliper cylinder of automobile brake |
| CN113700779A (en) * | 2021-07-05 | 2021-11-26 | 安徽江宏制动器有限公司 | Anti-deformation brake type caliper assembly |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191203 |