US2523174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Lummus Technology LLC
•
Filing: 1946-03-20
•
Granted: 1950-09-19
•
Expires: 1966-03-20
Abstract
No abstract record available.
Inventors
- 👤 George A Worn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:47
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US698290A
Cited
US729400A
Cited
US1954356A
Cited
US2060078A
Cited
US2412573A
Cited
US2376505A
Cited
US2411436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |