Patent US-1909-919834

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Operator stands upright on a platform and operates flapping wings, which have blades at the end capable of closing for the downstroke and opening on the upstroke. A sustaining aeroplane sits above the wings.

The wings will then assume a partly concave and partly convex position and the movable blades, being held in position by the wire strings, will rise to about an angle of 25°, giving thereby forward propulsion to the machine, while at the same time the wings lift the structure off the ground. At the same time as the forward motion is imparted, the aeroplane, which is located above the wings, assists, owing to its angle of inclination, in lifting the machine off the ground and prevents it from descending during the next upward stroke of the wings. The movable blades drop down during the up-stroke of the wings into a corresponding angle to the wings, but below the same, and assist thereby the forward propulsion, the wings assuming then a convexo-concave position [...]

Inventor location (imputed by HistPat): Coney Island, NY, Kings county, NY (FIPSloc=36047)


Year filed 1908
Year granted 1909
Office US
Patent number 919834
Inventors Rudolph G. Dressler
Inventor country US
Applicant person
Applicant firm
Applicant type INDIV
Applicant is inventor? Yes
Original title Flying-machine
English title Flying-machine
Tech fields flapping, frame, navigation, wheels, human-powered, airfoil, propulsion, hybrid, rudder, stability, takeoff
Filing date July 1, 1908
Full specification filed date
Application number 1908441334
Grant date April 27, 1909
Granted? Yes
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number 441334
Patent agent
Assigned to
National tech categories USPC 244/11, USPC 244/63
IPCs IPC B64C33/00
CPCs CPC B64C33/00
Family year 1908
First filing? Yes
Number of citations
Cited by
Application ID 47179283
INPADOC family ID 43861799
Number of text pages 2
Number of diagram pages 1
Number of figures 4
Number of claims 5