US3669770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making abrasion-resistant metal-coated glass photomasks
Assignee: RCA Corp
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Filing: 1971-02-08
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Granted: 1972-06-13
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Expires: 1991-02-08
Abstract
Abstract METHOD OF MAKING A LARGE-AREA METAL-COATED GLASS ARTICLE OF THE TYPE WHICH MUST RESIST ABRASION, COMPRISING FORMING A RELATIVELY THICK PATTERN OF METAL ON A TRANSPARENT GLASS SUBSTRATE BY AN ELECTROLESS DEPOSITION OF NICKEL-PHOSPHORUS ON THE SUBSTRATE AND HARDENING THE NICKEL-PHOSPHORUS LAYER BY HEAT TREATMENT AT TEMPERATURES NOT HIGHER THAN ABOUT 250*C.
Inventors
- 👤 Nathan Feldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; C; C03; C03C; C03C17/00; C03C17/06; C03C17/10; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1603; C23C18/1605; C23C18/18; C23C18/1851; C23C18/1872; C23C18/1886; C23C18/1893; C23C18/31; C23C18/32; C23C18/34; C23C18/36; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |