Patent US3968570A successfully refreshed from Google Patents.
Patent US2536971A successfully refreshed from Google Patents.
US2536971A
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Rotary tool on electric hammer
Assignee: Syntron Co
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Filing: 1949-03-02
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Granted: 1951-01-02
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Expires: 1969-03-02
Abstract
No abstract record available.
Inventors
- 👤 Carl S Weyandt
- 👤 William V Spurlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:40
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/064; B25D17/00; B25D17/20; B25D2217/00; B25D2217/0057; B25D2217/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2046210A
Cited
US2147045A
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US2223727A
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US2270752A
Cited
US2403034A
Cited
US2439230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |