Patent US2121920A successfully refreshed from Google Patents.
US2121920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
•
Filing: 1937-02-08
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Granted: 1938-06-28
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Expires: 1957-02-08
Abstract
No abstract record available.
Inventors
- 👤 Mallory Marion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:34
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1004; F02B19/1014; F02B19/1023; F02B19/1028; F02B19/1038; F02B19/1052; F02P; F02P15/00; F02P15/02; 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) | 1941-06-27 | 1941-12-27 | 1942-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-27 | 1945-12-27 | 1946-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-27 | 1949-12-27 | 1950-06-28 | $7700.00 | Window Closed / Lapsed |