US4077052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video disc capacitive recording means with a conductive bilayer
Assignee: RCA Corp
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Filing: 1977-05-04
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Granted: 1978-02-28
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Expires: 1997-05-04
Abstract
Abstract This invention relates to a capacitive recording means comprising a video disc with a thin conductive bilayer on the surface of the disc wherein the bilayer is a first layer of copper and a second layer of an alloy of nickel, chromium and iron which contains oxygen. An inorganic dielectric layer is disposed on the conductive layer.
Inventors
- 👤 John Louis Vossen, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:58
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/06; G11B9/061; G11B9/063; G11B9/066; 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: 12
Claim 1
Independent Claim
88 words
A capacitive recording means comprising: a. a disc having a spiral groove on a face thereof with video information in the form of geometric variations in said groove; b. A thin conductive bilayer film on said face having a first layer of copper and a second layer of an alloy of nickel and chromium which contains up to about 10% by weight of iron and contains from about 5 to about 25 average atomic percent of oxygen; and c. an inorganic dielectric layer disposed on said conductive film.
Claim 2
Dependent Claim
88 words
A capacitive recording means comprising: a. a disc having a spiral groove on a face thereof with video information in the form of geometric variations in said groove; b. A thin conductive bilayer film on said face having a first layer of copper and a second layer of an alloy of nickel and chromium which contains up to about 10% by weight of iron and contains from about 5 to about 25 average atomic percent of oxygen; and c. an inorganic dielectric layer disposed on said conductive film.
Claim 3
Dependent Claim
20 words
A capacitive recording means according to claim 1, wherein the copper layer is about 25 to about 50 angstroms thick.
Claim 4
Dependent Claim
20 words
A capacitive recording means according to claim 1, wherein the alloy layer is about 100 to about 400 angstroms thick.
Claim 5
Dependent Claim
32 words
A capacitive recording means according to claim 1, wherein the alloy layer contains about 76.8% by weight of nickel, about 13.8% by weight of chromium, and about 8.5% by weight of iron.
Claim 6
Dependent Claim
20 words
A capacitive recording means according to claim 1, wherein the inorganic layer is about 50 to about 250 angstroms thick.
Claim 7
Dependent Claim
17 words
A capacitive recording means according to claim 1, wherein the inorganic dielectric layer is a silicon oxide.
Claim 8
Dependent Claim
37 words
A capacitive recording means according to claim 6, wherein the oxygen content in the second layer at the interface of the second layer and the silicon oxide layer is from about 20 to about 35 atomic percent.
Claim 9
Dependent Claim
18 words
A capacitive recording means according to claim 1, wherein a lubricant layer is deposed over the dielectric layer.
Claim 10
Dependent Claim
37 words
A capacitive recording means according to claim 8, 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.
Claim 11
Dependent Claim
19 words
A capacitive recording means according to claim 8, wherein the lubricant is about 90 to about 400 angstroms thick.
Claim 12
Dependent Claim
20 words
A capacitive recording means according to claim 8, wherein the lubricant layer is about 180 to about 230 angstroms thick.
References Cited (Backward Citations)
US3842194A
Cited
US3842217A
Cited
US3909517A
Cited
US3843399A
Cited
US3901994A
Cited
US3982066A
Cited
US3984907A
Cited
US4004080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |