Patent US3142140A successfully refreshed from Google Patents.
US3142140A
Expired / Lapsed
US
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Process of manufacturing a precise non-spherical surface
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1961-04-18
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Granted: 1964-07-28
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Expires: 1981-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ishida Yasuhiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:25
CPC Classifications
B; B24; B24B; B24B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1448239A
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US1659277A
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US2392478A
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US2419543A
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US2634557A
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US2806327A
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US2836939A
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US2975565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |