CN106915043A - Mould with cooling effect fills mouth - Google Patents
Mould with cooling effect fills mouth Download PDFInfo
- Publication number
- CN106915043A CN106915043A CN201510985256.7A CN201510985256A CN106915043A CN 106915043 A CN106915043 A CN 106915043A CN 201510985256 A CN201510985256 A CN 201510985256A CN 106915043 A CN106915043 A CN 106915043A
- Authority
- CN
- China
- Prior art keywords
- mould
- section
- cooling
- flange portion
- cooling effect
- 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
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 73
- 230000000694 effects Effects 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 10
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
- B29C2045/7318—Construction of heating or cooling fluid flow channels multilayered fluid channel constructions
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A kind of mould with cooling effect fills mouth, comprising a runner body and a flange portion.The runner body is located at the cooling path inside the runner body with a cast gate and one, and the cooling path includes the U-shaped passage of multiple annular arrangements, and respectively the U-shaped channel interior can be network structure.The flange portion, it is engaged on the runner body, for being overlapped on an outer surface of the mould, foregoing cast gate is through the flange portion, and is formed with a sprue in the flange portion outer end, and the flange portion is provided with least one entrance and at least an outlet, the entrance is communicated to the cooling path of the runner body with outlet, and the mould is not contacted, extraneous gas can introduce the cooling path via the entrance, by outwards being derived by the outlet again behind the cooling path.
Description
Technical field
The invention relates to a kind of material feeding bushing of jetting mold, and in particular to a kind of cooling performance is good, nothing
Leak doubt, and can the mould with cooling effect of shortening forming time fill mouth.
Background technology
In the technology of ejection formation, in addition to considering the yield of component, in order to shorten shaping time, therefore, in mould
Perforate is promoted mould and a certain degree of samming is reached with the heat transfer of itself as cooling water channel on tool, with up to cooling glue
Body simultaneously reaches the purpose of shaping, and this is the technology known to industry.
For the filling mouth structure of traditional jetting mold, due to being not provided with cooling water channel, therefore the article shaping speed for projecting
Degree is slow, also influences the forming stability of article, base this, the design of more recent would generally be provided with cooling water channel on mouth is filled, and make
It is filled in and pours intraoral melted material and can quickly cool down, while finished product quality deterioration can be suppressed, its correlation technique has been found in
TaiWan, China announces I410319 patents of invention, and the patent is mainly that to be provided with one around the cast gate of a running channel body cold
But water route, so as to making melted material after injecting in mould, is followed using the coolant in cooling water channel to filling mouth
Ring cooling effect, to shorten melted material solidification required time, and then improve production efficiency and the forming stability for projecting object.
Really, burying cooling water channel adjacent to the region of cast gate in running channel body can no doubt reach fast cooling effect, but,
The patent is in order to improve cooling effectiveness, so cooling water channel is designed into C-shaped serpentine structure, therefore is difficult to use general machining
Method is formed, and, the water route exit and entrance of running channel body will also set corresponding to mould draining in itself and water supply path
Put so that fill mouth and be severely limited with assembling for mould, also easy leak, additionally, importantly, because of running channel sheet
Body works as anti-with the face that the injection port of Jet forming machine contacts it is pushed it to the running channel body of powder metallurgy forming
When being contacted with the injection port of Jet forming machine again, this part just gradually wears out, and the cooling water of running channel body interior can therewith
Can leakage, consequently, it is possible to when leak into the cooling water outside running channel body into cross gate and die cavity (cavity plate) inside when, general
The quality for being molded component is caused to deteriorate.
It is traditional to lean on cooling water channel to be cooled down to filling mouth according to upper, still cannot completely improve the problem of leak, therefore,
Fill mouth technology in, how for cooling water channel seepy question make improve, moreover it is possible to possess good cooling effect, be always industry
One of problem that boundary makes joint efforts.
The content of the invention
Mouth is filled it is an object of the invention to provide a kind of mould with cooling effect, it is using being looped around around cast gate it
The cooling path of network structure, is adopted and is cooled down in air cooling mode, except seepy question, more the pressurize mode to vacuumize can be overcome,
Allow filling mouth to be cooled down rapidly, except can significantly reduce molding time, also allow shaping component yield more stable.
Mould with cooling effect of the invention fills mouth, so as to the air cooling mode for vacuumizing, can be bestowed when from mould and added
Work is pressed, to abolish false vacuum, shaping component deformation is reduced.
Mould with cooling effect of the invention fills mouth, and during melted material is projected in filling, gas is presented not
Flow regime, so when possess and have good heat insulation effect.
It is that, up to above-mentioned purpose, solution of the invention is:
A kind of mould with cooling effect fills mouth, on a mould, including:
One runner body, is a cylinder, and with a cast gate, and at least one is located at cooling path inside the runner body, should
Cooling path includes the U-shaped passage of multiple annular arrangements, and respectively the U-shaped channel interior can be network structure;
One flange portion, is engaged on the runner body, and for being overlapped on an outer surface of the mould, foregoing cast gate is through this
Flange portion, and a sprue is formed with the flange portion outer end, the flange portion is provided with least one entrance and at least an outlet, should
Entrance is communicated to the cooling path of the runner body with outlet, and does not contact the mould, and extraneous gas can be introduced via entrance
The cooling path, by outwards being derived by the outlet again behind the cooling path.
Further, the flange portion has two entrances with two outlets.
Further, each U-shaped passage in the cooling path is engaged on this with one first section, one second section and one
Linkage section between first section and one second section, each entrance of the flange portion and outlet are more communicated with one first shunting
Road and one second runner, the first runner each in the entrance and outlet, that the second runner is respectively communicated to two is adjacent U-shaped
Second section and the first section of passage, to constitute the cooling path of circulation connection.
Further, the lateral cross section of the first section of each U-shaped passage and the second section is sector.
Further, the lateral cross section of the linkage section of each U-shaped passage is sector.
Further, foregoing cast gate is in coniform, by the outside gradually enlarged diameter of sprue, so that a discharging opening of the cast gate
With diameter greater than sprue diameter.
Further, when melted material is projected in filling, the cooling path to the respectively U-shaped passage vacuumizes, and allows the gas to be in
Now without flow regime.
Further, respectively the longitudinal cross-section of the U-shaped passage for straight to being in non-parallel with the cast gate of taper.
Further, respectively the longitudinal cross-section of the U is oblique, is in arranged in parallel with the cast gate of taper.It is mentioned above, be
Conventional mould is solved the problems, such as because abrasion causes leak, mould of the present invention with cooling effect fills mouth, using being looped around cast gate
The cooling path of the network structure of surrounding, is adopted and is cooled down in air cooling mode, except can overcome seepy question, the more pressurize to vacuumize
Mode, allows filling mouth to be cooled down rapidly, except can significantly reduce molding time, also allows component yield more stable.Also, can from
Compression motion is bestowed during mould, to abolish false vacuum, shaping component deformation is reduced.Secondly, the mistake of melted material is projected in filling
Cheng Zhong, because gas is presented not flow regime, so when possess and have good heat insulation effect.
Brief description of the drawings
Fig. 1 is the saturating figure of solid of the preferred embodiment that mould of the present invention with cooling effect fills mouth;
Fig. 2 is the sectional view extended along Fig. 1 center lines 2-2;
Fig. 3 is the sectional view extended along Fig. 1 center lines 3-3, is the longitudinal profile for showing the filling mouth;
Fig. 4 is the sectional view extended along Fig. 1 center lines 4-4, is the sectional drawing of the linkage section for showing the U-shaped passage;
Fig. 5 is the sectional view extended along Fig. 1 center lines 5-5, is the section of the first section and the second section for showing the U-shaped passage
Figure;
Fig. 6 is the similar view for being similar to Fig. 3, is the U-shaped passage that explanation be arranged in parallel with the cast gate.
【Symbol description】
100 fill the runner body of mouth 10
The sprue of 11 cast gate 12
The flange portion of 13 discharging opening 20
21 entrances 22 are exported
The runner of 23 first runner 24 second
The 30 cooling U-shaped passages in path 31
The section of 311 first section 312 second
The mould of 313 linkage section 200
201 outer surfaces.
Specific embodiment
Shown in reference picture 1, Fig. 2, Fig. 3, mould of the present invention with cooling effect fills the preferred embodiment of mouth, and this has
The mould of cooling effect fills mouth 100 for being arranged on a mould 200, to allow the melted material injection mould of injections when the ejection formation
In the middle of tool 200.The filling mouth 100 simultaneously includes a runner body 10 and a flange portion 20.
The runner body 10, is a cylinder, and with a cast gate 11, and a hidden cooling being located inside the runner body 11
Path 30, the cooling path 30 includes the U-shaped passage 31 of multiple annular arrangements, and respectively the inside of U-shaped passage 31 is network structure.
The flange portion 20, is engaged on the runner body 10, preceding for being overlapped on an outer surface 201 of the mould 200
State cast gate 11 and be through the flange portion 20, and a sprue 12 is formed with the outer end of flange portion 20, the flange portion 20 be provided with to
A few entrance 21 and at least one outlet 22, the entrance 21 are communicated to the cooling path 30 of the runner body 10 with outlet 22,
And do not contact the mould 200, extraneous gas can introduce the cooling path 30 via the entrance 21, by behind the cooling path 30 again
Outwards derived by the outlet 22.
In the present embodiment, the flange portion 20 has two entrances 21 and two outlets 22.Each U-shaped passage 31 simultaneously has
One first section 311, one second section 312 and one are engaged on the linkage section between the section 312 of the first section 311 and 1 second
313, each entrance 21 of the flange portion 20 and outlet 22 are more communicated with one first runner 23 and one second runner 24, respectively
The first runner 23, the second runner 24 on the entrance 21 and outlet 22 are respectively communicated to the of two adjacent U-shaped passages 31
Two sections 312 and the first section 311, to constitute the cooling path 30 of circulation connection.And, as shown in figure 4, each is U-shaped logical
First section 311 in road 31 and the lateral cross section of the second section 312 be sector, as shown in figure 5, and each U-shaped passage 31
The lateral cross section of linkage section 313 is also sector.
Further, in Fig. 1, Fig. 3, the cast gate 11 of the runner body 10 is outwards gradually expanded in coniform by sprue 12
Major diameter, so that the diameter of the discharging opening 13 with diameter greater than sprue 12 of the cast gate 11, and, respectively the U 31 is vertical
To section for straight to being in non-parallel with the cast gate 11 of taper.In addition, as shown in fig. 6, respectively the longitudinal direction of the U 31 is cut
Face can be set to oblique, with the cast gate 11 with taper in arranged in parallel, be parallel to each other by U-shaped passage 31 and cast gate 11 and make spacing
It is equal, enable cooling effect uniformity, cooling benefit can be lifted.
As shown in Figure 1 and Figure 2, when melted material is projected in filling, extraneous gas is sent into the cooling of the runner body 10 in advance
Path 30, gas is pumped into via respectively entrance 21 of the flange portion 20, is flowed into via respectively first and second runner 23,24 adjacent
The respectively U-shaped passage 31 the second section 312, the first block 311 after, then the water conservancy diversion of linkage section 313 for passing through the respectively U-shaped passage 31
To the first section 311, the second section 312, and flowed by the first section 311 of the adjacent respectively U-shaped passage 31, the second section 312
Into first and second runner 23,24 of the respectively outlet 22, finally pumped out via the respectively outlet 22.And on the implementation, can during filling
Vacuumized with to the cooling path 30, in the state of now gas is in without flowing, good heat insulation effect can be obtained, allowed
Fill mouth 100 to cool down rapidly, whereby, outside not only allowing cooling effect more preferable, can also significantly shorten the ejection formation time, and allow shaping
Component stability is better.
Further, after the completion of filling injection melted material, and it is intended to carry out during from mould operation, the cooling path can be bestowed and added
Press work, one can abolish false vacuum, two, the problem of shaping component deformation can be lowered, serve multiple.
Via described above, to solve the problems, such as that conventional water-cooled fills the easy leak of mouth;The present invention has cooling effect
Mould fills mouth, because the entrance 21 of the flange portion 20, outlet 22 are not connected with the repeats itself coolant flow channel of mould 200, adds
It is to be lowered the temperature with gas, so entirely without the problem of leak.And the cooling path 30 of the runner body 10 is except with staggeredly
The mode of circulation, ring is located at around cast gate 11, and more lowering the temperature by cold air reaches outside splendid cooling performance, and respectively this is U-shaped logical
Network structure inside road 31, more with fine and closely woven netted shunting action, allows gas to be evenly distributed on around cast gate 11, fast to reach
Quickly cooling use effect but, and negative pressure state is presented to take out air, filling mouth 100 can be rapidly cooled down after pressurize, allow cooling effect
More preferably, can significantly shortening forming time, and make shaping component yield more stable.Secondly, respectively the U-shaped passage 31 respectively this first
Section 311, the second section 312 and the cross section of linkage section 313 are all distributed with sector structure, can be increased outside film-cooled heat, more may be used
Enhance cooling benefit.And, the present invention can bestow compression motion, to abolish vacation so as to the air cooling mode for vacuumizing when from mould
Property vacuum, reduce shaping component deformation, it can be ensured that shaping component yield.
It is worth mentioning, though the entrance 21 of the flange portion 20, outlet 22 are set as that two enter two exit pattern in previous embodiment,
In implementation and as limitation, can also use single-input single-output, singly enter the mode for having more or entering more and singly go out, depending on different use demands
Any change can be made, it is using effect it has been observed that this no longer adds explanation.
A preferred embodiment of the invention is above are only, when the scope that implementation of the invention can not be limited with this, i.e., greatly
All simple equivalence changes made according to scope of the present invention patent and invention description content and modification, all should still belong to the present invention
In the range of patent covers.
Claims (9)
1. a kind of mould with cooling effect fills mouth, on a mould, it is characterised in that include:
One runner body, is a cylinder, and with a cast gate, and at least one is located at cooling path inside the runner body, should
Cooling path includes the U-shaped passage of multiple annular arrangements, and respectively the U-shaped channel interior is network structure;
One flange portion, is engaged on the runner body, and for being overlapped on an outer surface of the mould, foregoing cast gate is through this
Flange portion, and a sprue is formed with the flange portion outer end, the flange portion is provided with least one entrance and at least an outlet, should
Entrance is communicated to the cooling path of the runner body with outlet, and does not contact the mould, and extraneous gas is introduced via entrance should
Cooling path, by outwards being derived by the outlet again behind the cooling path.
2. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:The flange portion has two entrances
With two outlets.
3. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:Each U in the cooling path
Type passage has one first section, one second section and a linkage section being engaged between first section and one second section,
Each entrance of the flange portion and outlet are more communicated with one first runner and one second runner, respectively in the entrance and outlet
The first runner, the second runner be respectively communicated to second section and the first section of two adjacent U-shaped passages, followed with constituting
The cooling path of ring connection.
4. the mould with cooling effect as claimed in claim 3 fills mouth, it is characterised in that:The first of each U-shaped passage
The lateral cross section of section and the second section is sector.
5. the mould with cooling effect as claimed in claim 3 fills mouth, it is characterised in that:The connection of each U-shaped passage
The lateral cross section of section is sector.
6. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:Foregoing cast gate in coniform, by
The outside gradually enlarged diameter of sprue so that a discharging opening of the cast gate with diameter greater than sprue diameter.
7. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:When melted material is projected in filling,
Cooling path to the respectively U-shaped passage vacuumizes, and allows gas to present without flow regime.
8. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:Respectively the longitudinal direction of the U-shaped passage is cut
Face is for straight to being in non-parallel with the cast gate of taper.
9. the mould with cooling effect as claimed in claim 1 fills mouth, it is characterised in that:Respectively the longitudinal direction of the U is cut
Face is oblique, is in arranged in parallel with the cast gate of taper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510985256.7A CN106915043A (en) | 2015-12-25 | 2015-12-25 | Mould with cooling effect fills mouth |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510985256.7A CN106915043A (en) | 2015-12-25 | 2015-12-25 | Mould with cooling effect fills mouth |
Publications (1)
Publication Number | Publication Date |
---|---|
CN106915043A true CN106915043A (en) | 2017-07-04 |
Family
ID=59456582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201510985256.7A Pending CN106915043A (en) | 2015-12-25 | 2015-12-25 | Mould with cooling effect fills mouth |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106915043A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114474599A (en) * | 2020-10-23 | 2022-05-13 | 神讯电脑(昆山)有限公司 | Temperature regulation component, discharging device and die |
-
2015
- 2015-12-25 CN CN201510985256.7A patent/CN106915043A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114474599A (en) * | 2020-10-23 | 2022-05-13 | 神讯电脑(昆山)有限公司 | Temperature regulation component, discharging device and die |
CN114474599B (en) * | 2020-10-23 | 2024-03-19 | 神讯电脑(昆山)有限公司 | Temperature adjusting component, discharging device and die |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN205767264U (en) | A kind of cup injection forming mold | |
CN211389927U (en) | Mold cooling water channel | |
CN210362283U (en) | Quick cooling integral type runner cover | |
CN106915043A (en) | Mould with cooling effect fills mouth | |
TW201720619A (en) | Mold sprue bushing having cooling function which has good cooling effect without worrying about water leakage and can reduce molding time | |
CN209918854U (en) | Forming die for manufacturing hydraulic shaft core of gear box | |
CN114799121B (en) | Fully-sealed vacuumizing mold | |
CN203751301U (en) | Aluminum alloy motor cover mold with quick cooling structure | |
CN216941606U (en) | Reduce liquid no limit mould of deburring process | |
US20110256255A1 (en) | Mold having air-venting grooves | |
CN205147274U (en) | Multilocular die casting die of a mould | |
CN205439106U (en) | Mouth is irritated to mould with cooling action | |
CN105397992B (en) | Moulding mould | |
CN106042310A (en) | High-precision and high-efficiency injection mold | |
CN211990871U (en) | Die mould lower die structure with drainage structures | |
CN106694846A (en) | Multi-pouring-gate die-casting die | |
CN205818381U (en) | A kind of high-accuracy high-efficiency rate injection mold | |
CN206763884U (en) | For testing the particular manufacturing craft of casting forming flow stability plate casting | |
CN215472896U (en) | Cooling circulation structure in injection mold | |
CN221734768U (en) | Iron leakage prevention combined ingot mould | |
CN115958178A (en) | Mold flash exhaust structure | |
CN213919189U (en) | Peroxide material mold with good fluidity | |
CN219634377U (en) | Mouse roller mould | |
CN217044548U (en) | Low-pressure casting mould with double pouring gates | |
CN210632921U (en) | End cover die casting die runner structure |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170704 |
|
WD01 | Invention patent application deemed withdrawn after publication |