US1818339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: ACRO AG
•
Filing: 1929-04-19
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Granted: 1931-08-11
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Expires: 1949-04-19
Abstract
No abstract record available.
Inventors
- 👤 Lang Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:19
CPC Classifications
F; F02; F02B; F02B21/00; F02B19/00; F02B19/14; F02B23/00; F02B23/02; F02B23/06; F02B23/0603; F02B23/0633; F02B23/0636; F02B2275/00; F02B2275/16; F02B23/0618; F02B23/0621; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1934-08-10 | 1935-02-09 | 1935-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-10 | 1939-02-09 | 1939-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-10 | 1943-02-09 | 1943-08-11 | $7700.00 | Window Closed / Lapsed |