Patent US2771963A successfully refreshed from Google Patents.
US2771963A
Expired / Lapsed
US
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Air conditioning unit and air filter therefor
Assignee: Lennox Industries Inc
•
Filing: 1953-12-24
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Granted: 1956-11-27
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Expires: 1973-12-24
Abstract
No abstract record available.
Inventors
- 👤 Eichorn Robert Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:15
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/0007; F24F1/0071; F24F1/0073; B; B01; B01D; B01D46/00; B01D46/10; F24F8/00; F24F8/10; F24F8/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1847609A
Cited
US2265272A
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US1598097A
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US1862659A
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US2081553A
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US2160269A
Cited
US2337518A
Cited
US2621755A
Cited
US2674934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |