Patent US3604281A successfully refreshed from Google Patents.
Patent US2957321A successfully refreshed from Google Patents.
US2957321A
Expired / Lapsed
US
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Air conditioning apparatus
Assignee: Individual
•
Filing: 1958-07-18
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Granted: 1960-10-25
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
- 👤 Munters Carl Georg
- 👤 Norback Per Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:48
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1411; F24F3/1423; F24F2003/1458; F24F2003/1464; F24F2203/00; F24F2203/10; F24F2203/1004; F24F2203/1012; F24F2203/1016; F24F2203/1032; F24F2203/104; F24F2203/1056; F24F2203/1064; F24F2203/1072; F24F2203/1084; F24F2203/1096
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2266219A
Cited
US2186844A
Cited
US2344384A
Cited
US2134544A
Cited
US2197203A
Cited
US2200243A
Cited
US2723837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |