US2874941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazed extended surface heat exchanger
Assignee: Alstom Power Inc
•
Filing: 1955-09-06
•
Granted: 1959-02-24
•
Expires: 1975-09-06
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Woofard
- 👤 David G Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:38
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28D; F28D9/00; F28D9/0062; F28F2275/00; F28F2275/04; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/393; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172667A
Cited
US1492897A
Cited
US1751757A
Cited
US2566161A
Cited
US2703226A
Cited
US2595440A
Cited
DE910308C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |