US2804285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger formed of channel members
Assignee: Alstom Power Inc
•
Filing: 1952-09-10
•
Granted: 1957-08-27
•
Expires: 1972-09-10
Abstract
No abstract record available.
Inventors
- 👤 David G Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:09
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/453; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172667A
Cited
US1775819A
Cited
GB510206A
Cited
US2539870A
Cited
US2573538A
Cited
US2595457A
Cited
GB668349A
Cited
US2645462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |