US2638644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning and humidifying apparatus
Assignee: Individual
•
Filing: 1947-10-25
•
Granted: 1953-05-19
•
Expires: 1967-10-25
Abstract
No abstract record available.
Inventors
- 👤 John R Rauhut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:13
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; F24F6/043; F24F8/00; F24F8/20; F24F8/22; Y; Y10; Y10S; Y10S261/00; Y10S261/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1885142A
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US1239634A
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US1589428A
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US2047844A
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US2277552A
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US2347954A
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US2359057A
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US2389698A
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US2335056A
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US2430861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |