Patent US3485252A successfully refreshed from Google Patents.
US3485252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake duct for a gas turbine engine
Assignee: Rolls Royce PLC
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Filing: 1967-04-06
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Granted: 1969-12-23
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Expires: 1987-04-06
Abstract
No abstract record available.
Inventors
- 👤 David Morris Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/042; F02C7/045; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/0536
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |