US2420136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Six cycle engine
Assignee: Individual
•
Filing: 1944-10-11
•
Granted: 1947-05-06
•
Expires: 1964-10-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:51
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US334155A
Cited
US334153A
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US654356A
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US871632A
Cited
US1315954A
Cited
US1695704A
Cited
US1825959A
Cited
US2067171A
Cited
US2355806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |