US3833408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video discs having a methyl alkyl silicone coating
Assignee: RCA Corp
•
Filing: 1972-04-19
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Granted: 1974-09-03
•
Expires: 1992-04-19
Abstract
Abstract Application of certain methyl alkyl siloxane compounds to the surface of video disc replicas reduces surface friction generated during playback with no sacrifice in video quality.
Inventors
- 👤 D Matthies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:14
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; C; C10; C10M; C10M3/00; C10M7/00; G11B3/00; G11B3/68; G11B3/70; G11B3/705; G11B3/707; H; H04; H04N; H04N5/00; H04N5/76; H04N5/7605; H04N5/903; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2040/00; C10N2040/06; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/175; C10N2040/18; C10N2040/185; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
Storage means according to claim 1 wherein the alkyl group has 4-20 carbon atoms.
Claim 2
Dependent Claim
78 words
A capacitive video frequency recording means in the shape of a disc, having a spiral groove on a face thereof and video information in the form of geometric variations in the bottom of said groove, said disc having at least 1,000 grooves per inch, said disc having a thin conductive layer on said face, a thin dielectric layer disposed over the conductive layer and a thin coating of uniform thickness of a methyl alkyl silicone of the formula
Claim 3
Dependent Claim
16 words
A recording means according to claim 3 wherein the alkyl group has from 4-20 carton atoms.
Claim 4
Dependent Claim
19 words
A recording means according to claim 4 wherein the conductive layer is gold and the dielectric layer is polystyrene.
References Cited (Backward Citations)
GB153300A
Cited
US3072543A
Cited
US3109749A
Cited
US3288710A
Cited
US3466156A
Cited
US3578596A
Cited
US3537997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |