Patent EP0083464A1 successfully refreshed from Google Patents.
Patent US3299961A successfully refreshed from Google Patents.
US3299961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor
Assignee: Rolls Royce PLC
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Filing: 1965-05-05
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Granted: 1967-01-24
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Expires: 1985-05-05
Abstract
No abstract record available.
Inventors
- 👤 Coplin John Frederick
- 👤 Taylor Paul Alfred
- 👤 Petrie James Alexander
- 👤 Bracey Kenneth Edward George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:56
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/062; B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; F02K3/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A HELICOPTER ROTOR HAVING A PLURALITY OF ANGULARLY SPACED APART BLADES AND A PLURALITY OF GAS TURBINE ENGINES, ONE ON THE TIP OF EACH BLADE, EACH GAS TURBINE ENGINE HAVING A FIRST SHAFTING, A COMPRESSOR AND A TURBINE MOUNTED THEREON, A SECOND SHAFTING AXIALLY SPACED FROM THE FIRST SHAFTING, AND A FREE TURBINE MOUNTED THEREON AND DRIVEN BY THE GASES PASSING THROUGH THE ENGINE, THE SAID GASES DRIVING THE FIRST AND SECOND SHAFTINGS IN OPPOSITE ANGULAR SENSES.
Claim 2
Dependent Claim
77 words
A HELICOPTER ROTOR HAVING A PLURALITY OF ANGULARLY SPACED APART BLADES AND A PLURALITY OF GAS TURBINE ENGINES, ONE ON THE TIP OF EACH BLADE, EACH GAS TURBINE ENGINE HAVING A FIRST SHAFTING, A COMPRESSOR AND A TURBINE MOUNTED THEREON, A SECOND SHAFTING AXIALLY SPACED FROM THE FIRST SHAFTING, AND A FREE TURBINE MOUNTED THEREON AND DRIVEN BY THE GASES PASSING THROUGH THE ENGINE, THE SAID GASES DRIVING THE FIRST AND SECOND SHAFTINGS IN OPPOSITE ANGULAR SENSES.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |