Patent US2808237A successfully refreshed from Google Patents.
US2808237A
Expired / Lapsed
US
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Wall mounted air circulating heat exchangers
Assignee: Individual
•
Filing: 1953-02-16
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Granted: 1957-10-01
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Expires: 1973-02-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Fosnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:15
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; Y; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/302; Y10S165/31; Y10S165/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2029153A
Cited
US2040227A
Cited
GB571735A
Cited
US2451926A
Cited
US2550754A
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US2584442A
Cited
US2585132A
Cited
US2637532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |