Patent BE549025A successfully refreshed from Google Patents.
Patent US3285326A successfully refreshed from Google Patents.
US3285326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperative type heat exchanger
Assignee: Solar Turbines Inc
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Filing: 1964-09-18
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Granted: 1966-11-15
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Expires: 1984-09-18
Abstract
No abstract record available.
Inventors
- 👤 Leon R Wosika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:26
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/04; F28D9/0012; F28D9/0018; F28F; F28F2250/00; F28F2250/10; F28F2250/102
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
A RECUPERATOR FOR A POWER PLANT HAVING AN AIR INLET PASSAGE AND A COMBUSTION PRODUCTS OUTLET PASSAGE, SAID RECUPERATOR COMPRISING AN ANNULAR BODY COMPRISING A PAIR OF SPIRALLY WOUND CORRUGATED SHEETS, AND A PAIR OF SPIRALLY WOUND UNCORRUGATED SHEETS SEPARATING SAID CORRUGATED SHEETS, SAID CORRUGATED SHEETS PROVIDING PASSAGES EXTENDING HELICALLY FROM END TO END OF SAID BODY, MEANS CONNECTING THE OPPOSITE ENDS OF THE HELICAL PASSAGES OF ALTERNATE SHEETS TO SAID AIR INLET PASSAGES, AND MEANS CONNECTING THE OPPOSITE ENDS OF THE HELICAL PASSAGES OF THE REMAINING SHEETS TO SAID COMBUSTION PRODUCTS OUTLET PASSAGES.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |