Patent US2931644A successfully refreshed from Google Patents.
US2931644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work supporting stand
Assignee: Individual
•
Filing: 1957-11-19
•
Granted: 1960-04-05
•
Expires: 1977-11-19
Abstract
No abstract record available.
Inventors
- 👤 Louis C Kenworthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:17
CPC Classifications
B; B25; B25H; B25H1/00; B25H1/0007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US530437A
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US1204451A
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US1409266A
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FR539716A
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US1600835A
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US1749751A
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US2176551A
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US2301019A
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US2320079A
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US2627109A
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US2741830A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |