Patent US1832412A successfully refreshed from Google Patents.
US1832412A
Expired / Lapsed
US
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Heat exchange apparatus
Assignee: AMERICAN HEAT TRANSFER Co
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Filing: 1930-04-15
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Granted: 1931-11-17
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Expires: 1950-04-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence D Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:37
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0206; F28D1/0213; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/06; F28F9/10
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) | 1934-11-16 | 1935-05-18 | 1935-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-16 | 1939-05-18 | 1939-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-16 | 1943-05-18 | 1943-11-17 | $7700.00 | Window Closed / Lapsed |