Patent US2176924A successfully refreshed from Google Patents.
US2176924A
Expired / Lapsed
US
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Gear grinding machine
Assignee: Illinois Tool Works Inc
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Filing: 1930-09-26
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Granted: 1939-10-24
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Expires: 1950-09-26
Abstract
No abstract record available.
Inventors
- 👤 Carl G Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:56
CPC Classifications
B; B23; B23F; B23F5/00; B23F5/02; B23F5/06; Y; Y10; Y10T; Y10T409/00; Y10T409/10; Y10T409/101431
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-10-23 | 1943-04-24 | 1943-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-23 | 1947-04-24 | 1947-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-23 | 1951-04-24 | 1951-10-24 | $7700.00 | Window Closed / Lapsed |