US2767691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-fuel engines and processes of operating same
Assignee: Phillips Petroleum Co
•
Filing: 1955-02-07
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Granted: 1956-10-23
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Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Richard A Mengelkamp
- 👤 Lloyd B Grantham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
F; F02; F02D; F02D19/00; F02D19/06; F02D19/08; F02D19/10; F02B; F02B25/00; F02B25/02; F02B25/04; F02B43/00; F02B7/00; F02D19/0602; F02D19/0607; F02D19/061; F02D19/0639; F02D19/0642; F02D19/0647; F02D19/0663; F02D19/0684; F02D19/0686; F02D19/0689; F02D19/0692; F02M; F02M21/00; F02M21/02; F02M21/0218; F02M21/0287; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2201/00; F02B2201/06; F02B2201/066; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US673160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |