Patent US2420050A successfully refreshed from Google Patents.
US2420050A
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Hoist drum
Assignee: Library and Archives Canada
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Filing: 1945-03-21
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Granted: 1947-05-06
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Expires: 1965-03-21
Abstract
No abstract record available.
Inventors
- 👤 John H Maude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/36; B66D2700/00; B66D2700/01; B66D2700/0183; B66D2700/0191; Y; Y10; Y10S; Y10S242/00; Y10S242/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49481; Y10T29/4949
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US810490A
Cited
US1245231A
Cited
US1444002A
Cited
US1913508A
Cited
US1924216A
Cited
US1984604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |