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Patent US2706640A successfully refreshed from Google Patents.
US2706640A
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US
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Stair climbing hand truck
Assignee: FRANK L ROGERS
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Filing: 1951-01-12
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Granted: 1955-04-19
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Expires: 1971-01-12
Abstract
No abstract record available.
Inventors
- 👤 James M Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:01
CPC Classifications
B; B62; B62B; B62B5/00; B62B5/02; B62B5/026; B60; B60Y; B60Y2200/00; B60Y2200/40; B60Y2200/47; B60Y2200/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE187291C
Cited
US843034A
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US849270A
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US1056848A
Cited
US1191394A
Cited
US1551127A
Cited
US1660517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |