US2497947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioner
Assignee: Individual
•
Filing: 1946-02-16
•
Granted: 1950-02-21
•
Expires: 1966-02-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US706327A
Cited
US835895A
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US2051079A
Cited
US2010808A
Cited
US2035653A
Cited
US2087637A
Cited
US2189391A
Cited
US2187019A
Cited
US2333374A
Cited
US2376341A
Cited
US2380586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |