US2749600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchangers
Assignee: Rosenblads Patenter AB
•
Filing: 1955-02-14
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Granted: 1956-06-12
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Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Persson Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:38
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0041; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; F28F9/00; F28F9/007; F28F9/013; F28F9/0137; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49826; Y10T29/49881
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH219263A
Cited
US2691813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |