Patent US2736533A successfully refreshed from Google Patents.
US2736533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1953-03-26
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Granted: 1956-02-28
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Expires: 1973-03-26
Abstract
No abstract record available.
Inventors
- 👤 John L Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:40
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR397812A
Cited
US1238053A
Cited
US1930879A
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US2058098A
Cited
US2142679A
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US2131265A
Cited
GB486237A
Cited
US2251066A
Cited
US2281168A
Cited
US2402881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |