US2940253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of carbon deposits from jet engines
Assignee: Phillips Petroleum Co
•
Filing: 1954-03-26
•
Granted: 1960-06-14
•
Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 Donald E Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:24
CPC Classifications
F; F02; F02K; F02K3/00; F23; F23R; F23R3/00; F23R3/28; F23R3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191311756A
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US2050978A
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US2432502A
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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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |