US2539870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crossflow heat exchanger
Assignee: Modine Manufacturing Co
•
Filing: 1946-04-24
•
Granted: 1951-01-30
•
Expires: 1966-04-24
Abstract
No abstract record available.
Inventors
- 👤 Clyde S Simpelaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:34
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/453
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) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |