US3149802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autogiro
Assignee: Individual
•
Filing: 1961-09-11
•
Granted: 1964-09-22
•
Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Voorhis F Wigal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:24
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/02; B64C27/021; B64C27/022
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
A ROTARY WING AIRCRAFT COMPRISING A TILTABLE, GENERALLY VERTICAL, ROTOR MAST, A MAIN ROTOR MOUNTED FOR FREE ROTATION ON SAID MAST, AN AUXILIARY ROTOR OF LESSER RADIUS THAN SAID MAIN ROTOR, AND CONNECTED THERETO FOR ROTATION THEREWITH ON A COMMON AXIS, PITCH CONTROL MEANS FOR SAID AUXILIARY ROTOR, INDEPENDENT OF ANY PITCH CONTROL MEANS FOR SAID MAIN ROTOR, AN ENGINE WITH A FORWARD THRUST PROPELLER, AND MEANS MOUNTING SAID ENGINE FOR SWINGING MOVEMENT TO VARY THE INCLINATION OF THE THRUST AXIS OF SAID PROPELLER TOWARD AND AWAY FROM THE AREA SWEPT BY SAID AUXILIARY ROTOR.
References Cited (Backward Citations)
GB264286A
Cited
FR681763A
Cited
GB330513A
Cited
US1786576A
Cited
US2130918A
Cited
US2679364A
Cited
US2950074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |