US2643097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanger
Assignee: CA Parsons and Co Ltd
•
Filing: 1949-03-08
•
Granted: 1953-06-23
•
Expires: 1969-03-08
Abstract
No abstract record available.
Inventors
- 👤 Bowden Andrew Thomson
- 👤 Hryniszak Waldemar
- 👤 Kolb Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:02
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; 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)
US632442A
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US1516108A
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US1843252A
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US1772210A
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US2013499A
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US2224787A
Cited
GB543093A
Cited
US2367174A
Cited
US2446620A
Cited
GB620602A
Cited
US2483954A
Cited
US2480248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |