US1641960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled engine
Assignee: Individual
•
Filing: 1921-02-21
•
Granted: 1927-09-13
•
Expires: 1941-02-21
Abstract
No abstract record available.
Inventors
- 👤 Carl P Brockway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:11
CPC Classifications
F; F01; F01P; F01P1/00; F01P1/02; F02; F02B; F02B63/00; F02B63/04; F02B63/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-09-12 | 1931-03-14 | 1931-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-12 | 1935-03-14 | 1935-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-12 | 1939-03-14 | 1939-09-13 | $7700.00 | Window Closed / Lapsed |