US2540957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room air conditioner mixing fresh and recirculated air
Assignee: Old Carco LLC
•
Filing: 1947-04-12
•
Granted: 1951-02-06
•
Expires: 1967-04-12
Abstract
No abstract record available.
Inventors
- 👤 Alwin B Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:50
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/032; F24F1/0323; F24F1/03; F24F1/031; F24F1/0328; F24F1/035; F24F1/0358
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2127990A
Cited
US2146796A
Cited
US2236190A
Cited
US2130089A
Cited
US2123497A
Cited
US2296741A
Cited
US2272093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |