US2549583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanging apparatus
Assignee: Alstom Power Inc
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Filing: 1947-07-21
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Granted: 1951-04-17
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Expires: 1967-07-21
Abstract
No abstract record available.
Inventors
- 👤 Holand Charles Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/02; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28D19/044; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/01
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |