US2656112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic conditioned air system with compensation for clogging filter
Assignee: DON Manufacturing Co
•
Filing: 1949-07-07
•
Granted: 1953-10-20
•
Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Bruce G Copping
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:21
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/32; F24F11/39; F24F8/00; F24F8/10; F24F8/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |