Patent US2641325A successfully refreshed from Google Patents.
US2641325A
Expired / Lapsed
US
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Stair lift hand truck
Assignee: Individual
•
Filing: 1950-06-05
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Granted: 1953-06-09
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Expires: 1970-06-05
Abstract
No abstract record available.
Inventors
- 👤 George L Hoffman
- 👤 Simon J Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:16
CPC Classifications
B; B62; B62B; B62B5/00; B62B5/02; B62B5/023; B62B5/0026; B62B5/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR650856A
Cited
DE577797C
Cited
US709859A
Cited
US1191394A
Cited
US1979598A
Cited
US2004748A
Cited
US2400824A
Cited
US2467644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |