Patent US2328439A successfully refreshed from Google Patents.
US2328439A
Expired / Lapsed
US
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Heat transfer apparatus
Assignee: Individual
•
Filing: 1940-12-07
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Granted: 1943-08-31
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Expires: 1960-12-07
Abstract
No abstract record available.
Inventors
- 👤 Esnault-Pelterie Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:47
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/06; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F25B29/00; F25B29/003; F25B49/00; F25B49/02; F25B49/022; F02B2075/1804; F02B2075/184; F25B2400/00; F25B2400/07; F25B2400/074
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) | 1946-08-30 | 1947-03-01 | 1947-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-08-30 | 1951-03-01 | 1951-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-08-30 | 1955-03-01 | 1955-08-31 | $7700.00 | Window Closed / Lapsed |