Patent US3391501A successfully refreshed from Google Patents.
US3391501A
Expired / Lapsed
US
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Method for lapping
Assignee: Speedfam Corp
•
Filing: 1966-08-19
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Granted: 1968-07-09
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Expires: 1986-08-19
Abstract
No abstract record available.
Inventors
- 👤 Stephen A Boettcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:21
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/34; B24B37/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1371854A
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US1360054A
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US1548562A
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US1763647A
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US1528993A
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US2565590A
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US2627144A
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US2821818A
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US2912799A
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US2869294A
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US2883803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |