Patent US4003781A successfully refreshed from Google Patents.
Patent US2812190A successfully refreshed from Google Patents.
US2812190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand truck with convertible platform
Assignee: Individual
•
Filing: 1955-02-01
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Granted: 1957-11-05
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Expires: 1975-02-01
Abstract
No abstract record available.
Inventors
- 👤 Woodrow W Clifton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:44
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B1/14; B62B2202/00; B62B2202/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |