Patent US3433298A successfully refreshed from Google Patents.
US3433298A
Expired / Lapsed
US
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Heat exchanger especially for the cooling of hot gases
Assignee: SCHMIDT SCHE HEISSCLAMPF GmbH
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Filing: 1967-04-17
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Granted: 1969-03-18
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Frohmut Vollhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:30
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/02; F28F1/04; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1838; F22B1/1846; F28D; F28D7/00; F28D7/0041; F28D7/005; F28F1/10; F28F1/12; F28F1/14; F28F1/22; F28D21/00; F28D2021/0019; F28D2021/0075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE518290A
Cited
US2146261A
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US2195274A
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US2590465A
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DE835612C
Cited
FR1106016A
Cited
US3033535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |