Patent US2944581A successfully refreshed from Google Patents.
US2944581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimpling tool
Assignee: Zephyr Manufacturing Co Inc
•
Filing: 1956-09-04
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Granted: 1960-07-12
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Adolph A Shymanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:46
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1379165A
Cited
DE450440C
Cited
US2053720A
Cited
US2343278A
Cited
US2344944A
Cited
US2364813A
Cited
US2657083A
Cited
US2743933A
Cited
US2789619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |