Patent US2740237A successfully refreshed from Google Patents.
US2740237A
Expired / Lapsed
US
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Lapping machine
Assignee: SPITFIRE TOOL CO
•
Filing: 1954-09-10
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Granted: 1956-04-03
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Expires: 1974-09-10
Abstract
No abstract record available.
Inventors
- 👤 Day Lawrence
- 👤 Dobrick Joseph
- 👤 Kay Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:25
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/07; B24B37/10; B24B37/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1430214A
Cited
US2511831A
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US971861A
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US1972086A
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US1982648A
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US2398628A
Cited
US2404282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |