Patent US2638236A successfully refreshed from Google Patents.
US2638236A
Expired / Lapsed
US
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Hand truck
Assignee: Individual
•
Filing: 1950-11-22
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Granted: 1953-05-12
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Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Prowinsky
- 👤 David J Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:51
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/18; B62B1/22; B62B5/00; B62B5/04; B62B5/0438; B62B2203/00; B62B2203/02; B62B5/0485
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US206152A
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US375911A
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FR893555A
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US2338645A
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US2362749A
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US2444690A
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US2576048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |