US2270864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Western Cartridge Co
•
Filing: 1938-06-06
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Granted: 1942-01-27
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Expires: 1958-06-06
Abstract
No abstract record available.
Inventors
- 👤 Blais Emilien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:51
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F16; F16N; F16N39/00; F16N39/02; F28D7/0041; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0132; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
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) | 1945-01-26 | 1945-07-28 | 1946-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-26 | 1949-07-28 | 1950-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-26 | 1953-07-28 | 1954-01-27 | $7700.00 | Window Closed / Lapsed |