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US2420072A
Expired / Lapsed
US
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Differential hoist
Assignee: Individual
•
Filing: 1944-09-02
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Granted: 1947-05-06
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Expires: 1964-09-02
Abstract
No abstract record available.
Inventors
- 👤 Foote Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:25
CPC Classifications
B; B63; B63C; B63C7/00; B63C7/02; B63C7/04; B66; B66D; B66D1/00; B66D1/26; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US475172A
Cited
US853238A
Cited
US1104964A
Cited
GB191313249A
Cited
US1201337A
Cited
US1264257A
Cited
US1268082A
Cited
US1288108A
Cited
US2039870A
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 |