Patent US20040243162A1 successfully refreshed from Google Patents.
US2252064A
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Heat exchange unit and system
Assignee: Individual
•
Filing: 1938-10-22
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Granted: 1941-08-12
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Expires: 1958-10-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward S Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:13
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/0408; F28D1/0417; F24; F24F; F24F1/00; F24F1/0007; F24F1/0018; F24F1/0029; F24F1/0035; F24F1/0038; F24F1/0043; F24F1/0047; F24F1/0059; F24F1/0063; F28D1/0233; F28D1/024; F28D2001/0253; F28D2001/026; F28D2001/0266; F28D2001/0273
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) | 1944-08-11 | 1945-02-10 | 1945-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-11 | 1949-02-10 | 1949-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-11 | 1953-02-10 | 1953-08-12 | $7700.00 | Window Closed / Lapsed |