US2589262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Hydrocarbon Research Inc
•
Filing: 1946-06-12
•
Granted: 1952-03-18
•
Expires: 1966-06-12
Abstract
No abstract record available.
Inventors
- 👤 Percival C Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/106; F28F; F28F1/00; F28F1/10; F28F1/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR881258A
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US2460859A
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US2439208A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |