US2620170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer unit
Assignee: United States Steel Corp
•
Filing: 1950-08-18
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Granted: 1952-12-02
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Expires: 1970-08-18
Abstract
No abstract record available.
Inventors
- 👤 Alan E Brickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:24
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/04; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/122; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1604021A
Cited
GB331565A
Cited
US1832147A
Cited
US1913175A
Cited
US2052359A
Cited
GB452231A
Cited
US2469635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |