US4018945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a metallized video disc having an insulating layer thereon
Assignee: RCA Corp
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Filing: 1975-06-19
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Granted: 1977-04-19
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Expires: 1995-06-19
Abstract
Abstract A polymeric film applied to a video disc by glow discharge techniques is treated with a subsequent glow discharge in air to improve wear properties.
Inventors
- 👤 Robert Michael Mehalso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/06; G11B9/061; G11B9/063; G11B9/067; G11B23/00; G11B23/0057
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
In the method of making an information record comprising a disc having a spiral groove in a surface thereof, said groove containing an information track constituted by geometric variations within said groove coated with a first layer of a conductive metal and a second layer of a dielectric material which is applied by glow discharging said metal coated disc in the presence of a polymeric precursor, the improvement which comprises glow discharging said applied dielectric layer in the presence of an oxygen-containing gas.
Claim 2
Dependent Claim
83 words
In the method of making an information record comprising a disc having a spiral groove in a surface thereof, said groove containing an information track constituted by geometric variations within said groove coated with a first layer of a conductive metal and a second layer of a dielectric material which is applied by glow discharging said metal coated disc in the presence of a polymeric precursor, the improvement which comprises glow discharging said applied dielectric layer in the presence of an oxygen-containing gas.
Claim 3
Dependent Claim
12 words
The method according to claim 1 wherein said polymeric precursor is styrene.
Claim 4
Dependent Claim
19 words
The method according to claim 1 wherein said applied dielectric coating is glow discharged in the presence of air.
Claim 5
Dependent Claim
20 words
The method according to claim 1 wherein said applied dielectric coating is glow discharged in the presence of water vapor.
References Cited (Backward Citations)
US3309221A
Cited
US3457156A
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US3666533A
Cited
US3842217A
Cited
US3901994A
Cited
US3944709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |