US2481520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling cycle for internal-combustion engines
Assignee: ROBERT T COLLIER
•
Filing: 1944-02-07
•
Granted: 1949-09-13
•
Expires: 1964-02-07
Abstract
No abstract record available.
Inventors
- 👤 Marion F Knoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:40
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/10; F01P3/00; F01P3/22; F01P3/2271
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1897223A
Cited
FR676408A
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US1960821A
Cited
FR693689A
Cited
US1955345A
Cited
US2080195A
Cited
US2009067A
Cited
US2134188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |