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Patent US1393818A successfully refreshed from Google Patents.
US1393818A
Expired / Lapsed
US
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Rectified-tooth hob
Assignee: Illinois Tool Works Inc
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Filing: 1920-11-01
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Granted: 1921-10-18
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Expires: 1940-11-01
Abstract
No abstract record available.
Inventors
- 👤 Carl G Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:53
CPC Classifications
B; B23; B23F; B23F21/00; B23F21/12; B23F21/16; B23F21/163; B23F21/166; Y; Y10; Y10T; Y10T407/00; Y10T407/17; Y10T407/1715; Y10T407/1725
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) | 1924-10-17 | 1925-04-18 | 1925-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-10-17 | 1929-04-18 | 1929-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-10-17 | 1933-04-18 | 1933-10-18 | $7700.00 | Window Closed / Lapsed |