US2770097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling systems for engines that utilize heat
Assignee: Individual
•
Filing: 1952-02-14
•
Granted: 1956-11-13
•
Expires: 1972-02-14
Abstract
No abstract record available.
Inventors
- 👤 William C Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:15
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/42; F02K9/60; F02K9/62; F02K9/64; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB140516A
Cited
US2016921A
Cited
US2168313A
Cited
US2359108A
Cited
US2636345A
Cited
US2523656A
Cited
US2563028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |