Patent US2921623A successfully refreshed from Google Patents.
US2921623A
Expired / Lapsed
US
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Chair structure
Assignee: American Seating Co
•
Filing: 1958-06-23
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Granted: 1960-01-19
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Expires: 1978-06-23
Abstract
No abstract record available.
Inventors
- 👤 Douglas N Humphries
- 👤 Walter E Nordmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
A; A47; A47C; A47C5/00; A47C5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US574425A
Cited
US1524766A
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US1584826A
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US1547849A
Cited
US1999949A
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US1997486A
Cited
US2579606A
Cited
US2650648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |