Patent US3515501A successfully refreshed from Google Patents.
US3515501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade assembly
Assignee: Rolls Royce PLC
•
Filing: 1968-04-11
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Granted: 1970-06-02
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Expires: 1988-04-11
Abstract
No abstract record available.
Inventors
- 👤 Jack Palfreyman
- 👤 Henry Edward Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:51
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3023; F01D5/303; F01D5/3038; F01D21/00; F01D21/04; F01D21/045; F01D5/12; F01D5/28; F01D5/282
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA611006A
Cited
US1544318A
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US2155231A
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US2713991A
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US2873088A
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US2857094A
Cited
US3279967A
Cited
US3391540A
Cited
US3393436A
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US3403844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |