Patent US3348618A successfully refreshed from Google Patents.
US3348618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor
Assignee: Power Jets Research and Development Ltd
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Filing: 1965-10-15
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Granted: 1967-10-24
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Expires: 1985-10-15
Abstract
No abstract record available.
Inventors
- 👤 Flint John Avery
- 👤 George James Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:31
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A HELICOPTER ROTOR COMPRISING A NON-ROTATABLE MEMBER, A HEAD MEMBER ROTATABLY MOUNTED ON SAID NON-ROTATABLE MEMBER, AT LEAST ONE ROTOR BLADE ATTACHED TO SAID HEAD MEMBER TO ROTATE THEREWITH, AT LEAST ONE LONG SHALLOW APERTURE IN THE SURFACE OF EACH BLADE EXTENDING ALONG THE BLADE SPAN, MEANS FOR FEEDING A FLUID FLOW TO THE HEAD MEMBER, MEANS DIVIDING EACH APERTURE SPANWISE INTO AT LEAST TWO SEPARATE SECTIONS, PASSAGES FORMED IN EACH BLADE, EACH PASSAGE CONNECTED TO CONDUCT FLUID FLOW FROM THE HEAD MEMBER TO ONE OF SAID SPANWISE APERTURE SECTIONS FOR DISCHARGE AS A THIN LAYER OVER THE BLADE SURFACE, AND MEANS FOR INDEPENDENTLY VARYING THE FLUID FLOWING TO EACH OF SAID PASSAGES.
Claim 2
Dependent Claim
113 words
A HELICOPTER ROTOR COMPRISING A NON-ROTATABLE MEMBER, A HEAD MEMBER ROTATABLY MOUNTED ON SAID NON-ROTATABLE MEMBER, AT LEAST ONE ROTOR BLADE ATTACHED TO SAID HEAD MEMBER TO ROTATE THEREWITH, AT LEAST ONE LONG SHALLOW APERTURE IN THE SURFACE OF EACH BLADE EXTENDING ALONG THE BLADE SPAN, MEANS FOR FEEDING A FLUID FLOW TO THE HEAD MEMBER, MEANS DIVIDING EACH APERTURE SPANWISE INTO AT LEAST TWO SEPARATE SECTIONS, PASSAGES FORMED IN EACH BLADE, EACH PASSAGE CONNECTED TO CONDUCT FLUID FLOW FROM THE HEAD MEMBER TO ONE OF SAID SPANWISE APERTURE SECTIONS FOR DISCHARGE AS A THIN LAYER OVER THE BLADE SURFACE, AND MEANS FOR INDEPENDENTLY VARYING THE FLUID FLOWING TO EACH OF SAID PASSAGES.
References Cited (Backward Citations)
US3096041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |