Patent US4252848A successfully refreshed from Google Patents.
US4252848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorinated polymer thin films
Assignee: RCA Corp
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Filing: 1977-04-11
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Granted: 1981-02-24
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Expires: 1997-04-11
Abstract
Abstract Thin, stable, low surface energy perfluorinated polymer films can be applied to a substrate by glow discharging the substrate in the presence of a perfluorocycloalkane or -cycloolefin or perfluoroalkyl-substituted derivatives thereof.
Inventors
- 👤 Pabitra Datta
- 👤 Grzegorz Kaganowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:40
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/62; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24537; Y10T428/24545; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A method of applying thin, stable, low surface energy polymer films to a substrate which comprises exposing said substrate to a glow discharge in the presence of a gaseous compound selected from the group consisting of perfluorocycloalkanes, perfluorocycloolefines and perfluoroalkyl-substituted derivatives thereof.
Claim 2
Independent Claim
42 words
A method of applying thin, stable, low surface energy polymer films to a substrate which comprises exposing said substrate to a glow discharge in the presence of a gaseous compound selected from the group consisting of perfluorocycloalkanes, perfluorocycloolefines and perfluoroalkyl-substituted derivatives thereof.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein an inert gas is also present with the gaseous compound.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein said gaseous compound is perfluoro-1,3-dimethylcylohexane.
Claim 5
Dependent Claim
12 words
A method according to claim 1 wherein said gaseous compound is perfluorodimethylcyclobutene.
Claim 6
Dependent Claim
12 words
A method according to claim 1 wherein said gaseous compound is perfluorocyclohexene.
Claim 7
Dependent Claim
166 words
An information record adapted for use with a playback stylus to effect recovery of signals occupying the bandwidth of at least several megahertz when relative motion and a desired rate is established between said record and said stylus, said record comprising (a) a disc having a spiral groove in the surface thereof, said groove being dimensioned for reception therein of said stylus and containing an information track constituted by geometric variations in the groove, (b) a continuous conductive metal layer on said surface, said layer being of substantially uniform thickness and (c) a thin dielectric coating of uniform thickness overlying said metal layer, said dielectric coating being a perfluorinated polymer applied by glow discharging said metal coated disc in the presence of a gaseous compound selected from the group consisting of perfluorocycloalkanes, perfluorocycloolefines and perfluoroalkyl-substituted derivatives thereof, and wherein the combined thickness of said conductive layer and said dielectric coating do not fill said groove, allowing for reception of said stylus within said groove during playback.
Claim 8
Dependent Claim
166 words
An information record adapted for use with a playback stylus to effect recovery of signals occupying the bandwidth of at least several megahertz when relative motion and a desired rate is established between said record and said stylus, said record comprising (a) a disc having a spiral groove in the surface thereof, said groove being dimensioned for reception therein of said stylus and containing an information track constituted by geometric variations in the groove, (b) a continuous conductive metal layer on said surface, said layer being of substantially uniform thickness and (c) a thin dielectric coating of uniform thickness overlying said metal layer, said dielectric coating being a perfluorinated polymer applied by glow discharging said metal coated disc in the presence of a gaseous compound selected from the group consisting of perfluorocycloalkanes, perfluorocycloolefines and perfluoroalkyl-substituted derivatives thereof, and wherein the combined thickness of said conductive layer and said dielectric coating do not fill said groove, allowing for reception of said stylus within said groove during playback.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |