US2445115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: United States Department of Agriculture
•
Filing: 1944-04-07
•
Granted: 1948-07-13
•
Expires: 1964-04-07
Abstract
No abstract record available.
Inventors
- 👤 Francis P Hanrahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:53
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; F28D7/0066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US536354A
Cited
US1046298A
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US1657202A
Cited
US1815938A
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US1854619A
Cited
US2003593A
Cited
US2066480A
Cited
US2053623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-13 | 1952-01-12 | 1952-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-13 | 1956-01-12 | 1956-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-13 | 1960-01-12 | 1960-07-13 | $7700.00 | Window Closed / Lapsed |