US2495978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opposed piston engine, four cycle
Assignee: Individual
•
Filing: 1947-04-28
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Granted: 1950-01-31
•
Expires: 1967-04-28
Abstract
No abstract record available.
Inventors
- 👤 Willard A Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
F; F01; F01B; F01B7/00; F01B7/02; F01B7/14; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B75/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |