Patent US2837031A successfully refreshed from Google Patents.
Patent US3249154A successfully refreshed from Google Patents.
US3249154A
Expired / Lapsed
US
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Heat exchanger
Assignee: Individual
•
Filing: 1961-11-03
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Granted: 1966-05-03
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Expires: 1981-11-03
Abstract
No abstract record available.
Inventors
- 👤 Legrand Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:10
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/26; F28F1/34; F28F1/36; F28F1/42; F28F1/424; F28F1/426; F28F13/00; F28F13/06; F28F13/12; F28F9/00; F28F9/26; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442; Y10S165/452
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT3980B
Cited
US2406121A
Cited
CH308651A
Cited
US3111168A
Cited
US3030292A
Cited
US2998228A
Cited
US3030293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |