US4072985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video disc with a dielectric layer formed from styrene and nitrogen
Assignee: RCA Corp
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Filing: 1977-05-04
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Granted: 1978-02-07
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Expires: 1997-05-04
Abstract
Abstract This invention relates to a video disc with a thin polymeric dielectric layer formed from styrene and nitrogen. The dielectric layer has improved age deterioration resistance, wear characteristics and adhesion to a metal conductive layer.
Inventors
- 👤 Grzegorz Kaganowicz
- 👤 John W. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:01
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/06; G11B9/061; G11B9/063; G11B9/067; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
A capacitive recording means comprising a disc having a spiral groove on the face thereof with audio/video information in the form of geometric variations in said groove, a thin conductive layer thereon and a thin dielectric layer formed from styrene and nitrogen in a glow discharge on said conductive layer.
Claim 2
Dependent Claim
50 words
A capacitive recording means comprising a disc having a spiral groove on the face thereof with audio/video information in the form of geometric variations in said groove, a thin conductive layer thereon and a thin dielectric layer formed from styrene and nitrogen in a glow discharge on said conductive layer.
Claim 3
Dependent Claim
22 words
A recording means according to claim 1 wherein the dielectric layer contains from about 2 to about 12 atomic percent of nitrogen.
Claim 4
Dependent Claim
22 words
A recording means according to claim 1 wherein the dielectric layer contains from about 4 to about 6 atomic percent of nitrogen.
Claim 5
Dependent Claim
18 words
A recording means according to claim 1 wherein the dielectric layer is about 50 to 500 angstroms thick.
Claim 6
Dependent Claim
47 words
A recording means according to claim 1 wherein the conductive layer is a bilayer of a first copper layer and a nickel/chromium/iron alloy layer wherein the iron content is less than 10 percent by weight and the oxygen content is about 5 to about 20 atomic percent.
Claim 7
Dependent Claim
31 words
A recording means according to claim 5 wherein the copper layer is from about 25 to 50 angstroms thick and the alloy layer is from about 100 to 400 angstroms thick.
Claim 8
Dependent Claim
20 words
A capacitive recording means according to claim 1 wherein the recording means has a lubricant layer on said dielectric layer.
Claim 9
Dependent Claim
21 words
A capacitive recording means according to claim 7 wherein the lubricant layer is from about 90 to about 400 angstroms thick.
Claim 10
Dependent Claim
21 words
A capacitive recording means according to claim 7 wherein the lubricant layer is from about 180 to about 230 angstroms thick.
Claim 11
Dependent Claim
34 words
A capacitive recording means according to claim 7 wherein the lubricant layer is silicon compound having the formula ##STR2## wherein R is an alkyl group of 4-20 carbon atoms and x is an integer.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |