US2420779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opposed piston engine
Assignee: Individual
•
Filing: 1944-04-10
•
Granted: 1947-05-20
•
Expires: 1964-04-10
Abstract
No abstract record available.
Inventors
- 👤 Carl L Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:56
CPC Classifications
F; F01; F01B; F01B7/00; F01B7/02; F01B7/14; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1171854A
Cited
US1237696A
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DE390461C
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US1339187A
Cited
FR24091E
Cited
US1476309A
Cited
DE439350C
Cited
US2031318A
Cited
US1845601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |