Patent US2445400A successfully refreshed from Google Patents.
US2445400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Descent retarder
Assignee: Individual
•
Filing: 1944-11-27
•
Granted: 1948-07-20
•
Expires: 1964-11-27
Abstract
No abstract record available.
Inventors
- 👤 Johnston Loreene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:16
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1140444A
Cited
US1135537A
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US1270200A
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US1719048A
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US1662406A
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US1765818A
Cited
US1856999A
Cited
US2052086A
Cited
US2094105A
Cited
GB457983A
Cited
US2227204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |