US2858110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanger
Assignee: Combustion Engineering Inc
•
Filing: 1955-08-04
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Granted: 1958-10-28
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Expires: 1975-08-04
Abstract
No abstract record available.
Inventors
- 👤 Henry J Blaskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F23; F23L; F23L15/00; F23L15/02; F28D13/00; F28D19/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/018
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |