Patent US2452035A successfully refreshed from Google Patents.
US2452035A
Expired / Lapsed
US
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Door operating mechanism for powder hoists
Assignee: Individual
•
Filing: 1944-03-10
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Granted: 1948-10-26
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Expires: 1964-03-10
Abstract
No abstract record available.
Inventors
- 👤 George A Chadwick
- 👤 Philias H Girouard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:36
CPC Classifications
F; F42; F42B; F42B39/00; F42B39/14; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0848; Y10T292/0849; Y10T292/0853
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US564474A
Cited
US1105813A
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US1371738A
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US1392583A
Cited
US1465990A
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US1849385A
Cited
US2260080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |