US2684232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal air washer and conditioner
Assignee: Individual
•
Filing: 1951-06-27
•
Granted: 1954-07-20
•
Expires: 1971-06-27
Abstract
No abstract record available.
Inventors
- 👤 William J Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:27
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875755A
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US1342152A
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US1841556A
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US1952308A
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US2171248A
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US2074818A
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US2295101A
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US2408250A
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US2441631A
Cited
US2565596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |