US3523574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal regenerator
Assignee: United States Department of the Air Force
•
Filing: 1969-03-06
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Granted: 1970-08-11
•
Expires: 1989-03-06
Abstract
No abstract record available.
Inventors
- 👤 William L Haskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
F; F25; F25J; F25J5/00; F25J5/002; C; C09; C09K; C09K5/00; C09K5/08; C09K5/14; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/082; F25B; F25B2309/00; F25B2309/003; F25J2205/00; F25J2205/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3397738A
Cited
US3375867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |