Patent GB477889A successfully refreshed from Google Patents.
US2251351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treadle process
Assignee: Individual
•
Filing: 1940-12-03
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Granted: 1941-08-05
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Expires: 1960-12-03
Abstract
No abstract record available.
Inventors
- 👤 Cooper Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:35
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/02; H; H01; H01H; H01H3/00; H01H3/02; H01H3/14; H01H3/141; H01H3/142
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) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |