US3795534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of video discs
Assignee: RCA Corp
•
Filing: 1972-04-19
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Granted: 1974-03-05
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Expires: 1992-04-19
Abstract
Abstract A METHOD OF FORMING A VIDEO DISC WITH A UNIFORM GROOVE RADIUS FROM A DISC HAVING GROOVES OF NONUNIFORM RADIUS AND DEPTH BY APPLYING AN EXCESS OF PHOTORESIST TO THE GROOVED DISC SURFACE WHILE ROTATING THE DISC RAPIDLY ONLY LONG ENOUGH TO DRIVE OFF THE EXCESS PHOTORESIST AND ALLOWING THE REMAINING PHOTORESIST TO DRY WHILE ROTATING THE DISC VERY SLOWLY.
Inventors
- 👤 R Mehalso
- 👤 D Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:26
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/16; G03F7/162; G11; G11B; G11B7/00; G11B7/24; G11B7/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |