Patent US2434519A successfully refreshed from Google Patents.
US2434519A
Expired / Lapsed
US
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Heat exchange conduit with a spiral fin having a capillary groove
Assignee: Individual
•
Filing: 1942-04-18
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Granted: 1948-01-13
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Expires: 1962-04-18
Abstract
No abstract record available.
Inventors
- 👤 Raskin Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/16; F28F1/02; F28F1/06; Y; Y10; Y10S; Y10S165/00; Y10S165/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1715378A
Cited
US1874578A
Cited
US1996808A
Cited
US2162083A
Cited
US2241086A
Cited
US2281206A
Cited
US2287492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-12 | 1951-07-14 | 1952-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-12 | 1955-07-14 | 1956-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-12 | 1959-07-14 | 1960-01-13 | $7700.00 | Window Closed / Lapsed |