US2662749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular flow heat exchanger
Assignee: Hydrocarbon Research Inc
•
Filing: 1949-01-21
•
Granted: 1953-12-15
•
Expires: 1969-01-21
Abstract
No abstract record available.
Inventors
- 👤 Herman F Buschow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:22
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1148865A
Cited
US1912644A
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US1932610A
Cited
US2034428A
Cited
US2372079A
Cited
US2521369A
Cited
US2549466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |