Patent US4137550A successfully refreshed from Google Patents.
US4137550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video disc with a dielectric layer formed from acetylene and nitrogen
Assignee: RCA Corp
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Filing: 1977-11-18
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Granted: 1979-01-30
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Expires: 1997-11-18
Abstract
Abstract This invention relates to a video disc with a thin polymeric dielectric layer formed from acetylene and nitrogen in a glow discharge. The dielectric layer has improved age deterioration resistance and wear characteristics and can be prepared with low power levels.
Inventors
- 👤 Grzegorz Kaganowicz
- 👤 John W. Robinson
- 👤 Hirotsugu Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:26
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; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
A capacitive recording means comprising a disc having a spiral groove on a 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 acetylene 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 a 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 acetylene 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 1.5 to about 8 atomic percent of nitrogen.
Claim 4
Dependent Claim
22 words
A recording means according to claim 1 wherein the dielectric layer contains from about 2.5 to about 5 atomic percent of nitrogen.
Claim 5
Dependent Claim
19 words
A recording means according to claim 1 wherein the dielectric layer is about 50 to about 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 angstoms 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 200 to about 250 angstroms thick.
Claim 11
Dependent Claim
35 words
A capacitive recording means according to claim 7 wherein the lubricant layer is a silicon compound having the formula ##STR3## 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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |