US2669923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system
Assignee: Individual
•
Filing: 1950-10-09
•
Granted: 1954-02-23
•
Expires: 1970-10-09
Abstract
No abstract record available.
Inventors
- 👤 Knepper Bonnie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:21
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2187767A
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US1000366A
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US1338916A
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US1788556A
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US1958342A
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US2391859A
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US1916907A
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US2036851A
Cited
US2022523A
Cited
US2021521A
Cited
US2198867A
Cited
US2234037A
Cited
US2241108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |