US2578550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifluid heat exchanger
Assignee: Alstom Power Inc
•
Filing: 1946-01-25
•
Granted: 1951-12-11
•
Expires: 1966-01-25
Abstract
No abstract record available.
Inventors
- 👤 Holm Sven
- 👤 Karlsson Per Hilmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:07
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/103
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |