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Patent US2058022A successfully refreshed from Google Patents.
US2058022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1934-05-05
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Granted: 1936-10-20
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Expires: 1954-05-05
Abstract
No abstract record available.
Inventors
- 👤 Lebre Albert Francois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:30
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28F; F28F2250/00; F28F2250/10; F28F2250/104; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373; Y10S165/383; Y10S165/909
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) | 1939-10-20 | 1940-04-20 | 1940-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-10-20 | 1944-04-20 | 1944-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-10-20 | 1948-04-20 | 1948-10-20 | $7700.00 | Window Closed / Lapsed |