US2711632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release-relief valve for adjustable chairs
Assignee: American Optical Corp
•
Filing: 1949-01-12
•
Granted: 1955-06-28
•
Expires: 1969-01-12
Abstract
No abstract record available.
Inventors
- 👤 Charles A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/30; A61; A61G; A61G15/00; A61G15/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7837
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1706309A
Cited
US1887328A
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US1959682A
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US2095286A
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US1953606A
Cited
US2059130A
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US2215666A
Cited
US2132363A
Cited
US2445334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-27 | 1958-12-27 | 1959-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-27 | 1962-12-27 | 1963-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-27 | 1966-12-27 | 1967-06-28 | $7700.00 | Window Closed / Lapsed |