US2749671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge grinding machines
Assignee: American Optical Corp
•
Filing: 1951-04-06
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Granted: 1956-06-12
•
Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Oscar W Dillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/08; B24B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2233312A
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US2434919A
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US2321383A
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US2438724A
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US2445806A
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US2653427A
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US2512354A
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US2539468A
Cited
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 |