Patent US-1894-530219

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Wings will catch the air on the downstroke but let it pass through when moving back up, due to design with flexible cords; operated by human on platform underneath

  • Inventor location: Brooklyn, Kings county, NY (FIPSloc=36047, imputed by HistPat)
  • 1/6 assigned to Charles Friedrich Zenker of New York, NY.

Patent family descending from Patent US-1894-530219

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Year filed 1894
Year granted 1894
Office US
Patent number 530219
Inventors Nicholas H. Borgfeldt
Inventor country US
Applicant person Nicholas H. Borgfeldt
Applicant firm
Applicant type
Applicant is inventor? 1
Original title Apparatus for aerial navigation
English title Apparatus for aerial navigation
Tech fields LTA, flapping, valve, human-powered, feathering
Filing date 1894-01-27
Full specification filed date
Application number
Grant date 1894-12-04
Granted? 1
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number 498168
Patent agent
Assigned to Charles Friedrich Zenker
National tech categories USPC 244/64
IPCs IPC B64C31/04
CPCs CPC B64C31/04
Family year 1894
First filing? 1
Cites these patents
Citations from after 1930
Application ID 46467460
INPADOC family ID
Number of text pages
Number of diagram pages
Number of figures
Number of claims