Patent US-1909-934717

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Many fan propellers, in pairs, with 'feathering' motion to maximize downstroke; vertical lift envisioned thus: "as the blades are evenly distributed around the entire frame and are of exactly the same area, and travel at uniform speed, the lifting force will be equal at all points, and the machine will rise in a vertical line"

  • Tech class CPC B64C39/005: Aircraft not otherwise provided for with wings, paddle wheels, bladed wheels, moving or rotating in relation to the fuselage about a horizontal transversal axis
  • Inventor location: Minot, Ward county, ND (FIPSloc=38101)

Sources


Year filed 1908
Year granted 1909
Office US
Patent number 934717
Inventors De Witt C Dorman
Inventor country US
Inventor location
Applicant person De Witt C Dorman
Applicant firm
Applicant type INDIV
Applicant is inventor? 1
Original title Flying-machine
English title Flying-machine
Tech fields aerodrome, propulsion, navigation
Filing date 1908-12-21
Full specification filed date
Application number 1908468598
Grant date September 21, 1909
Granted? 1
Publication date
Supplementary to patent
Related to aircraft? 1
Serial number 468598
Patent agent C. A. Snow & Co.
Assigned to
National tech categories USPC 244/20
IPCs IPC B64C39/00
CPCs CPC B64C39/005
Family year 1908
First filing? 1
Cites these patents
Citations from after 1930 0
Application ID 47228219
INPADOC family ID 43877296
Number of text pages 3
Number of diagram pages 3
Number of figures 7
Number of claims 6