Patent US3422623A successfully refreshed from Google Patents.
US3422623A
Expired / Lapsed
US
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Jet engines with cooling means
Assignee: Rolls Royce PLC
•
Filing: 1967-01-19
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Granted: 1969-01-21
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Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 John Alexander Henderson Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:10
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/12; F02C7/16; F02C7/18; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/822; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2397998A
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US2591676A
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US2868500A
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US2625793A
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US2639579A
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US2652216A
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US2853854A
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US3024606A
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US3269119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |