US3211570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making sine wave gratings
Assignee: Individual
•
Filing: 1961-12-21
•
Granted: 1965-10-12
•
Expires: 1981-12-21
Abstract
No abstract record available.
Inventors
- 👤 Winfield W Salisbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:12
CPC Classifications
B; B23; B23K; B23K15/00; B23K15/08; H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; H01J37/3053; H01J37/3056
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1890893A
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US2314902A
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US3023137A
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US2906914A
Cited
US2908595A
Cited
US3019125A
Cited
US3059611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |