Patent US2749672A successfully refreshed from Google Patents.
US2749672A
Expired / Lapsed
US
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Process and apparatus for grinding piston and other rings
Assignee: Motors Liquidation Co
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Filing: 1951-04-10
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Granted: 1956-06-12
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Expires: 1971-04-10
Abstract
No abstract record available.
Inventors
- 👤 John M Haldeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/08; B24B19/11
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |