US2136153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger and method of making same
Assignee: Rosenblads Patenter AB
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Filing: 1935-04-11
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Granted: 1938-11-08
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Expires: 1955-04-11
Abstract
No abstract record available.
Inventors
- 👤 Rosenblad Curt Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:59
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/04; B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/398; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-11-07 | 1942-05-09 | 1942-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-07 | 1946-05-09 | 1946-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-07 | 1950-05-09 | 1950-11-08 | $7700.00 | Window Closed / Lapsed |