US3288225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor
Assignee: Power Jets Research and Development Ltd
•
Filing: 1964-11-02
•
Granted: 1966-11-29
•
Expires: 1984-11-02
Abstract
No abstract record available.
Inventors
- 👤 Flint John Avery
- 👤 George James Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0025; B64C27/00; B64C27/20; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A HELICOPTER ROTOR ASSEMBLY COMPRISING A NON-ROTATABLE MEMBER, A HEAD MEMBER ROTATABLY MOUNTED ON SAID MEMBER, AT LEAST ONE ROTOR BLADE ATTACHED TO SAID HEAD MEMBER TO ROTATE THEREWITH, AT LEAST ONE LONG SHALLOW APERTURE EXTENDING ALONG THE BLADE SPAN IN THE SURFACE OF EACH SAID BLADE, MEANS FOR FEEDING A FLUID FLOW TO THE HEAD MEMBER, MEANS CONNECTED TO CONDUCT SAID FLUID FROM THE HEAD MEMBER TO EACH SAID APERTURE FOR DISCHARGE THEREFROM AS A THIN LAYER OVER THE BLADE SURFACE, AND NON-ROTATING CONTROL MEANS FOR VARYING THE AERODYNAMIC LIFT ON EACH BLADE WHEREIN THE CONTROL MEANS COMPRISES AN ANNULAR VALVE ASSEMBLY IN COMMUNICATION WITH THE MEANS FOR FEEDING THE FLUID FLOW TO THE HEAD MEMBER, THE VALVE ASSEMBLY BEING MOUNTED COAXIALLY RELATIVE TO SAID HEAD MEMBER AND HAVING CONCENTRIC WALLS WITH RADIAL PARTITIONS EXTENDING BETWEEN THEM SO AS TO FORM A PLURALITY OF AXIALLY EXTENDING PASSAGES FOR THE FLUID FLOW TO THE HEAD MEMBER AND A VALVE SLIDABLY MOUNTED IN EACH OF THE SAID PASSAGES TO REGULATE THE FLUID FLOW THEREIN.
Claim 2
Dependent Claim
173 words
A HELICOPTER ROTOR ASSEMBLY COMPRISING A NON-ROTATABLE MEMBER, A HEAD MEMBER ROTATABLY MOUNTED ON SAID MEMBER, AT LEAST ONE ROTOR BLADE ATTACHED TO SAID HEAD MEMBER TO ROTATE THEREWITH, AT LEAST ONE LONG SHALLOW APERTURE EXTENDING ALONG THE BLADE SPAN IN THE SURFACE OF EACH SAID BLADE, MEANS FOR FEEDING A FLUID FLOW TO THE HEAD MEMBER, MEANS CONNECTED TO CONDUCT SAID FLUID FROM THE HEAD MEMBER TO EACH SAID APERTURE FOR DISCHARGE THEREFROM AS A THIN LAYER OVER THE BLADE SURFACE, AND NON-ROTATING CONTROL MEANS FOR VARYING THE AERODYNAMIC LIFT ON EACH BLADE WHEREIN THE CONTROL MEANS COMPRISES AN ANNULAR VALVE ASSEMBLY IN COMMUNICATION WITH THE MEANS FOR FEEDING THE FLUID FLOW TO THE HEAD MEMBER, THE VALVE ASSEMBLY BEING MOUNTED COAXIALLY RELATIVE TO SAID HEAD MEMBER AND HAVING CONCENTRIC WALLS WITH RADIAL PARTITIONS EXTENDING BETWEEN THEM SO AS TO FORM A PLURALITY OF AXIALLY EXTENDING PASSAGES FOR THE FLUID FLOW TO THE HEAD MEMBER AND A VALVE SLIDABLY MOUNTED IN EACH OF THE SAID PASSAGES TO REGULATE THE FLUID FLOW THEREIN.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |