US2257631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: American Motors Corp
•
Filing: 1939-11-13
•
Granted: 1941-09-30
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Expires: 1959-11-13
Abstract
No abstract record available.
Inventors
- 👤 Wahlberg Nils Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:22
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/243; F02B; F02B2275/00; F02B2275/34; F02F1/42; F02F1/4264; F02F2001/4278; Y; Y10; Y10S; Y10S123/00; Y10S123/06
Claims Analysis
Total Claims: 0
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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) | 1944-09-29 | 1945-03-31 | 1945-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-29 | 1949-03-31 | 1949-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-29 | 1953-03-31 | 1953-09-30 | $7700.00 | Window Closed / Lapsed |