US2620169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate type heat exchanger
Assignee: English Electric Co Ltd
•
Filing: 1949-06-16
•
Granted: 1952-12-02
•
Expires: 1969-06-16
Abstract
No abstract record available.
Inventors
- 👤 Gross William Lawrence
- 👤 Hughes John Oliver Philip
- 👤 Wolff Paul Heinz Walter
- 👤 Frankel Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:44
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037; F28D9/0006; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1647997A
Cited
US1417387A
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US1726458A
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US1734962A
Cited
US1805652A
Cited
GB285550A
Cited
US1775103A
Cited
US1831533A
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 |