US2774573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanger with reciprocable rods
Assignee: Alstom Power Inc
•
Filing: 1952-07-16
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Granted: 1956-12-18
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Expires: 1972-07-16
Abstract
No abstract record available.
Inventors
- 👤 Holm Sven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:39
CPC Classifications
F; F28; F28D; F28D19/00; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/014
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |