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US2709953A
Expired / Lapsed
US
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Air conditioning system
Assignee: Individual
•
Filing: 1950-05-22
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Granted: 1955-06-07
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Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 Walter E Engle
- 👤 David E Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:58
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2614478A
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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) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |