Patent US2121804A successfully refreshed from Google Patents.
US2121804A
Expired / Lapsed
US
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Oxidized plunger and spring
Assignee: Adlake Co
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Filing: 1934-10-17
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Granted: 1938-06-28
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Expires: 1954-10-17
Abstract
No abstract record available.
Inventors
- 👤 Carl H Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:35
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/40; H; H01; H01H; H01H29/00; H01H29/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-06-27 | 1941-12-27 | 1942-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-27 | 1945-12-27 | 1946-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-27 | 1949-12-27 | 1950-06-28 | $7700.00 | Window Closed / Lapsed |