Patent US2720736A successfully refreshed from Google Patents.
US2720736A
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US
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Valve grinding machine
Assignee: Leavitt Machine Co
•
Filing: 1953-09-01
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Granted: 1955-10-18
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Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Walter E Mcafee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:40
CPC Classifications
B; B24; B24B; B24B15/00; B24B15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US513392A
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US685697A
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US801350A
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US789469A
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US1667918A
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US1787871A
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US1761326A
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US2408280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |