Patent US2331909A successfully refreshed from Google Patents.
US2331909A
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Gear and the like
Assignee: Duracell Inc USA
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Filing: 1940-12-04
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Granted: 1943-10-19
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Expires: 1960-12-04
Abstract
No abstract record available.
Inventors
- 👤 Franz R Hensel
- 👤 Earl I Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:05
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; B21; B21K; B21K1/00; B21K1/28; B21K1/30; B22F5/00; B22F5/08; F; F16; F16H; F16H55/00; F16H55/02; F16H55/06; Y; Y10; Y10S; Y10S74/00; Y10S74/10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49467; Y10T29/4948; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/18104; Y10T74/19; Y10T74/19949; Y10T74/19963
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) | 1946-10-18 | 1947-04-19 | 1947-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-10-18 | 1951-04-19 | 1951-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-10-18 | 1955-04-19 | 1955-10-19 | $7700.00 | Window Closed / Lapsed |