US2573544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled internal-combustion engine
Assignee: Individual
•
Filing: 1946-10-02
•
Granted: 1951-10-30
•
Expires: 1966-10-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Colby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:24
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F01P5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US818735A
Cited
US1045061A
Cited
US1130444A
Cited
US1263336A
Cited
US1279128A
Cited
CH199876A
Cited
US2274743A
Cited
CH220009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |