Patent US2675841A successfully refreshed from Google Patents.
US2675841A
Expired / Lapsed
US
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Drill
Assignee: National Gypsum Co
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Filing: 1951-07-28
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Granted: 1954-04-20
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Expires: 1971-07-28
Abstract
No abstract record available.
Inventors
- 👤 John A Einhiple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/02; B23B2251/00; B23B2251/18; B23B2251/20; B23B2251/201; B23B2251/24; B23B2251/241; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/899; Y10T408/90
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |