US2268360A
Expired / Lapsed
US
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Heat exchange apparatus
Assignee: Fedders Manufacturing Co Inc
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Filing: 1940-06-28
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Granted: 1941-12-30
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Expires: 1960-06-28
Abstract
No abstract record available.
Inventors
- 👤 Edmund R Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:17
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; F28D1/04; F28D1/047; F28D1/053; F28D1/05316; F28F; F28F1/00; F28F1/02; F28F1/025; F28F9/00; F28F9/001; F28F9/02; F28F9/0236; F28F9/0239; F28F9/026; F28F9/0282; F28D7/00; F28D7/16; F28D7/1615; F28F1/10; F28F1/12; F28F1/34; F28F1/36; F28F2265/00; F28F2265/26; F28F2275/00; F28F2275/14; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/053; Y10S165/054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-12-29 | 1945-06-30 | 1945-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-12-29 | 1949-06-30 | 1949-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-12-29 | 1953-06-30 | 1953-12-30 | $7700.00 | Window Closed / Lapsed |