Patent US2314495A successfully refreshed from Google Patents.
US3210027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed pitch rotor helicopter
Assignee: COPPERFIELD CORP
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Filing: 1963-07-29
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Granted: 1965-10-05
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Irven H Culver
- 👤 Johnston J Ford
- 👤 Warren D Orr
- 👤 William E Orr
- 👤 Charles E Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:44
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C1/00; B64C27/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A SMALL HELICOPTER, COMPRISING: (A) AN ELONGATED FUSELAGE; (B) A PAIR OF SPACED, SUBSTANTIALLY PARALLEL, GENERALLY VERTICALLY EXTENDING ROTOR SHAFTS JOURNALLED ON SAID FUSELAGE; (C) A ROTOR HAVING A PLURALITY OF ROTOR BLADES EXTENDING RADIALLY FROM THE UPPER END OF EACH OF SAID SHAFTS AND CONNECTED THERETO AT A FIXED PITCH ANGLE COMPETENT TO PRODUCE SUBSTANTIAL LIFT WHEN SAID ROTORS ARE ROTATED; (D) POWER MEANS FOR DRIVING SAID SHAFTS AND SAID ROTORS IN COUNTER DIRECTIONS; (E) DISENGAGEABLE CONNECTING MEANS CONNECTING SAID POWER MEANS TO SAID SHAFTS AND SAID ROTORS AND PERMITTING ROTATION OF SAID ROTORS WHEN NOT DRIVEN BY SAID POWER MEANS, AND (F) SAID ROTORS BEING CAPABLE OF STABLE AUTOROTATION AT A LOW REYNOLDS NUMBER WHEN SAID HELICOPTER IS IN THE AIR AND SAID ROTORS ARE NOT DRIVEN BY SAID POWER MEANS;
Claim 2
Dependent Claim
133 words
A SMALL HELICOPTER, COMPRISING: (A) AN ELONGATED FUSELAGE; (B) A PAIR OF SPACED, SUBSTANTIALLY PARALLEL, GENERALLY VERTICALLY EXTENDING ROTOR SHAFTS JOURNALLED ON SAID FUSELAGE; (C) A ROTOR HAVING A PLURALITY OF ROTOR BLADES EXTENDING RADIALLY FROM THE UPPER END OF EACH OF SAID SHAFTS AND CONNECTED THERETO AT A FIXED PITCH ANGLE COMPETENT TO PRODUCE SUBSTANTIAL LIFT WHEN SAID ROTORS ARE ROTATED; (D) POWER MEANS FOR DRIVING SAID SHAFTS AND SAID ROTORS IN COUNTER DIRECTIONS; (E) DISENGAGEABLE CONNECTING MEANS CONNECTING SAID POWER MEANS TO SAID SHAFTS AND SAID ROTORS AND PERMITTING ROTATION OF SAID ROTORS WHEN NOT DRIVEN BY SAID POWER MEANS, AND (F) SAID ROTORS BEING CAPABLE OF STABLE AUTOROTATION AT A LOW REYNOLDS NUMBER WHEN SAID HELICOPTER IS IN THE AIR AND SAID ROTORS ARE NOT DRIVEN BY SAID POWER MEANS;
Claim 3
Dependent Claim
78 words
A HELICOPTER ROTOR, COMPRISING: (A) A HUB ADAPTED TO BE SUPPORTED FOR ROTATION ABOUT A GENERALLY VERTICAL AXIS; (B) A PLURALITY OF ROTOR BLADES EXTENDING RADIALLY FROM SAID HUB AND SECURED THERETO AT A PREDETERMINED FIXED PITCH ANGLE OF THE ORDER OF 5 TO 8 DEGREES; (C) SAID BLADES EACH HAVING A CROSS SECTION CAPABLE, AT SAID PITCH ANGLE, OF PRODUCING SUBSTANTIAL LIFT WHEN SO ROTATED UNDER POWER AND STABLE AUTOROTATION AT A LOW REYNOLDS NUMBER WHEN UNPOWERED.
Claim 4
Dependent Claim
78 words
A HELICOPTER ROTOR, COMPRISING: (A) A HUB ADAPTED TO BE SUPPORTED FOR ROTATION ABOUT A GENERALLY VERTICAL AXIS; (B) A PLURALITY OF ROTOR BLADES EXTENDING RADIALLY FROM SAID HUB AND SECURED THERETO AT A PREDETERMINED FIXED PITCH ANGLE OF THE ORDER OF 5 TO 8 DEGREES; (C) SAID BLADES EACH HAVING A CROSS SECTION CAPABLE, AT SAID PITCH ANGLE, OF PRODUCING SUBSTANTIAL LIFT WHEN SO ROTATED UNDER POWER AND STABLE AUTOROTATION AT A LOW REYNOLDS NUMBER WHEN UNPOWERED.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |