US2852233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchangers especially for combustion turbines
Assignee: CA Parsons and Co Ltd
•
Filing: 1952-12-23
•
Granted: 1958-09-16
•
Expires: 1972-12-23
Abstract
No abstract record available.
Inventors
- 👤 Hryniszak Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:50
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1762320A
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US1741225A
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GB649265A
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US2631870A
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US2757907A
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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) | 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 |