US3451342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic engine system and method
Assignee: Individual
•
Filing: 1965-10-24
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Granted: 1969-06-24
•
Expires: 1985-10-24
Abstract
No abstract record available.
Inventors
- 👤 Everett H Schwartzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:44
CPC Classifications
F; F01; F01K; F01K25/00; F01K25/08; F01K25/10; F02; F02C; F02C1/00; F02C1/04; F17; F17C; F17C9/00; F17C9/02; F17C9/04; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2227/00; F17C2227/01; F17C2227/0128; F17C2227/0135; F17C2227/03; F17C2227/0302
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US230323A
Cited
FR615351A
Cited
US1101001A
Cited
US1002768A
Cited
US984585A
Cited
GB191123624A
Cited
US1119063A
Cited
FR484305A
Cited
GB221203A
Cited
GB282773A
Cited
GB657020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |