US2489405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual fuel engine
Assignee: Caterpillar Inc
•
Filing: 1947-08-09
•
Granted: 1949-11-29
•
Expires: 1967-08-09
Abstract
No abstract record available.
Inventors
- 👤 William L H Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:22
CPC Classifications
F; F02; F02D; F02D19/00; F02D19/06; F02D19/08; F02D19/10; F02D19/0602; F02D19/0607; F02D19/0663; F02D19/0684; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1882990A
Cited
US1065551A
Cited
GB537024A
Cited
US2340954A
Cited
US2400219A
Cited
US2400247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |