Patent US2540836A successfully refreshed from Google Patents.
US2540836A
Expired / Lapsed
US
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Knife changing device
Assignee: E P LAWSON Co Inc
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Filing: 1947-06-07
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Granted: 1951-02-06
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Expires: 1967-06-07
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Seybold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:39
CPC Classifications
B; B23; B23D; B23D35/00; B23D35/008; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53704; Y10T83/00; Y10T83/748; Y10T83/7487; Y10T83/7493; Y10T83/869; Y10T83/8821; Y10T83/909; Y10T83/913; Y10T83/97
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1377042A
Cited
US1503408A
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US1766855A
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US1743946A
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US2008645A
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US1945703A
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US2113598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |