US2852232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: General Precision Laboratory Inc
•
Filing: 1953-03-30
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Granted: 1958-09-16
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Expires: 1973-03-30
Abstract
No abstract record available.
Inventors
- 👤 Edward M Marwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:14
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/006; F; F24; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/16; F24H1/162; F28; F28D; F28D7/00; F28D7/0008; F28D7/0016; F28D7/02; F28D7/024; F28F; F28F1/00; F28F1/10; F28F27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1958791A
Cited
US2308293A
Cited
GB575593A
Cited
US2508988A
Cited
US2455551A
Cited
US2549569A
Cited
US2541201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |