Patent US3524712A successfully refreshed from Google Patents.
US3524712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor blade for a gas turbine engine
Assignee: Rolls Royce PLC
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Filing: 1967-05-08
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Granted: 1970-08-18
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Expires: 1987-05-08
Abstract
No abstract record available.
Inventors
- 👤 James A Petrie
- 👤 John M S Keen
- 👤 Gordon C May
- 👤 Albert J Moreton
- 👤 Frank Littleford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:03
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/321; F04D29/324; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1544318A
Cited
US1998393A
Cited
GB574440A
Cited
US2463340A
Cited
CH246346A
Cited
GB660007A
Cited
GB680014A
Cited
US3216699A
Cited
US3394918A
Cited
US3396905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |