Patent US2646460A successfully refreshed from Google Patents.
Patent US2018037A successfully refreshed from Google Patents.
US2018037A
Expired / Lapsed
US
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Heat exchanger
Assignee: Foster Wheeler Inc
•
Filing: 1933-09-29
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Granted: 1935-10-22
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Expires: 1953-09-29
Abstract
No abstract record available.
Inventors
- 👤 Sieder Everett Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:09
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0132; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/053; Y10S165/054; Y10S165/055
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) | 1938-10-21 | 1939-04-22 | 1939-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-21 | 1943-04-22 | 1943-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-21 | 1947-04-22 | 1947-10-22 | $7700.00 | Window Closed / Lapsed |