US2670936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sinuous wire element as extended surface on undulated heat exchanger plate wall
Assignee: Alstom Power Inc
•
Filing: 1951-10-23
•
Granted: 1954-03-02
•
Expires: 1971-10-23
Abstract
No abstract record available.
Inventors
- 👤 Holm Sven
- 👤 Jensen Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR865252A
Cited
US2596642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |