Patent US4863762A successfully refreshed from Google Patents.
US4863762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming coating film of fluororesin by physical vapor deposition
Assignee: Central Glass Co Ltd
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Filing: 1988-03-18
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Granted: 1989-09-05
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Expires: 2008-03-18
Abstract
Abstract In forming a coating film of a fluororesin, e.g. polytetrafluoroethylene, on a metallic or nonmetallic surface by a physical vapor deposition technique, problems attributed to the necessity of intensely heating or bombarding the fluororesin as the evaporating source or target material are solved by using a molecular weight reduced fluororesin not higher than 5000 in molecular weight. It is best to use a low molecular weight fluororesin powder obtained by heating a high molecular weight fluororesin in presence of a fluorine source and precipitating the molecular weight reduced polymer from the reaction gas.
Inventors
- 👤 Minoru Aramaki
- 👤 Masahiro Kubo
- 👤 Hisaji Nakano
- 👤 Hiroyuki Kurashige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:31
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
A method of forming a film of a fluorine-containing polymer on a substrate surface by a physical vapor deposition technique, comprising providing a molecular weight reduced fluorine-containing polymer having a molecular weight lower than 5000, said molecular weight reduced fluorine-containing polymer being fine particles precipitated from a reaction gas produced by reacting a fluorine-containing polymer having a molecular weight higher than 5000 with fluorine at an elevated temperature; and using said molecular weight reduced fluorine-containing polymer as the source material for physical vapor deposition.
Claim 2
Independent Claim
84 words
A method of forming a film of a fluorine-containing polymer on a substrate surface by a physical vapor deposition technique, comprising providing a molecular weight reduced fluorine-containing polymer having a molecular weight lower than 5000, said molecular weight reduced fluorine-containing polymer being fine particles precipitated from a reaction gas produced by reacting a fluorine-containing polymer having a molecular weight higher than 5000 with fluorine at an elevated temperature; and using said molecular weight reduced fluorine-containing polymer as the source material for physical vapor deposition.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said physical vapor deposition technique is selected from the group consisting of vacuum evaporation technique, sputtering technique and ion plating technique.
Claim 4
Dependent Claim
49 words
A method according to claim 1, wherein said physical vapor deposition technique is vacuum evaporation technique, said molecular weight reduced fluorine-containing polymer being heated at a temperature in the range from 100° to 350° C. at a pressure in the range of from 10 -1 to 10 -6 Torr.
Claim 5
Dependent Claim
43 words
A method according to claim 1, wherein said molecular weight reduced fluorine-containing polymer is selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, copolymer of ethylene and tetrafluoroethylene, copolymer of tetrafluoroethylene and hexafluoropropylene and copolymer of tetrafluoroethylene and a perfluoroalkoxyethylene.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein said substrate surface is a metallic surface.
Claim 7
Dependent Claim
15 words
A method according to claim 1, wherein said substrate surface is an organic polymer surface.
Claim 8
Dependent Claim
15 words
A method according to claim 1, wherein said substrate surface is an inorganic nonmetallic surface.
Claim 9
Independent Claim
93 words
A method of forming a film of polytetrafluoroethylene on a substrate surface by vacuum evaporation technique, comprising using fine particles of polytetrafluoroethylene having a molecular weight of from about 1000 to about 3000 as the evaporating source, said particles being precipitated from a reaction gas produced by reacting polytetrafluoroethylene having a molecular weight higher than 3000 with fluorine at an elevated temperature, and heating the particles of polytetrafluoroethylene at a temperature in the range from 100° to 350° C. at a pressure in the range of from 10 -1 to 10 -6 Torr.
Claim 10
Independent Claim
93 words
A method of forming a film of polytetrafluoroethylene on a substrate surface by vacuum evaporation technique, comprising using fine particles of polytetrafluoroethylene having a molecular weight of from about 1000 to about 3000 as the evaporating source, said particles being precipitated from a reaction gas produced by reacting polytetrafluoroethylene having a molecular weight higher than 3000 with fluorine at an elevated temperature, and heating the particles of polytetrafluoroethylene at a temperature in the range from 100° to 350° C. at a pressure in the range of from 10 -1 to 10 -6 Torr.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |