US2865611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary regenerative heat exchanger
Assignee: CA Parsons and Co Ltd
•
Filing: 1953-03-13
•
Granted: 1958-12-23
•
Expires: 1973-03-13
Abstract
No abstract record available.
Inventors
- 👤 Bentele Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:03
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; F02; F02C; F02C7/00; F02C7/08; F02C7/10; F02C7/105; F28G; F28G9/00; F28G9/005; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02; Y10S165/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1315822A
Cited
DE545523C
Cited
US1970127A
Cited
GB543093A
Cited
US2347829A
Cited
US2667034A
Cited
US2537558A
Cited
US2583671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |