US2935262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper operated gas valve for unit ventilator
Assignee: American Air Filter Co Inc
•
Filing: 1956-09-12
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Granted: 1960-05-03
•
Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; G05D23/24
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |