Patent JPS56140249A successfully refreshed from Google Patents.
Patent US2713996A successfully refreshed from Google Patents.
US2713996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1952-10-23
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Granted: 1955-07-26
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Expires: 1972-10-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John E Pottharst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:01
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/26; F28D; F28D7/00; F28D7/10; F28D7/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US444533A
Cited
US477813A
Cited
US1826253A
Cited
US2085677A
Cited
US2120498A
Cited
US2424221A
Cited
FR980414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |