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Patent US2693020A successfully refreshed from Google Patents.
US2693020A
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US
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Inserted blade hob
Assignee: Michigan Tool Co
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Filing: 1951-08-30
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Granted: 1954-11-02
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Expires: 1971-08-30
Abstract
No abstract record available.
Inventors
- 👤 Pelphrey Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:44
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; Y10T407/19; Y10T407/1906; Y10T407/1934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |