Patent US2521841A successfully refreshed from Google Patents.
US2521841A
Expired / Lapsed
US
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Air cooling by evaporization of water
Assignee: Individual
•
Filing: 1945-10-15
•
Granted: 1950-09-12
•
Expires: 1965-10-15
Abstract
No abstract record available.
Inventors
- 👤 Herman G Forrester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:06
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; Y; Y10; Y10S; Y10S261/00; Y10S261/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1428661A
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US1923355A
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US2045215A
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US2157531A
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US2196644A
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US2150514A
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US2307298A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |