US2420325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for operating internal-combustion engines
Assignee: Individual
•
Filing: 1942-10-07
•
Granted: 1947-05-13
•
Expires: 1962-10-07
Abstract
No abstract record available.
Inventors
- 👤 Nettel Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
F; F02; F02B; F02B1/00; F02M; F02M21/00; F02M21/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE199205C
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US2080420A
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US2363708A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |