Patent US2686044A successfully refreshed from Google Patents.
US2686044A
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US
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Heat exchanger
Assignee: John Cockerill SA
•
Filing: 1949-10-14
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Granted: 1954-08-10
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Expires: 1969-10-14
Abstract
No abstract record available.
Inventors
- 👤 Maldague Pierre Edmond J Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:22
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/005; F28D7/08; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/492
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1125758A
Cited
GB112222A
Cited
US1655086A
Cited
US1869973A
Cited
DE563894C
Cited
AU113631A
Cited
US2346822A
Cited
GB570115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |