Patent DE-1908-227004

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  • Inventor location: Grunewald

"Grunewald is a locality (Ortsteil) within the Berlin borough (Bezirk) of Charlottenburg-Wilmersdorf."[1]

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Year filed 1908
Year granted 1910
Office DE
Patent number 227004
Inventors Hermann Ruthenberg
Inventor country DE
Applicant person Hermann Ruthenberg
Applicant firm
Applicant type INDIV
Applicant is inventor? Yes
Original title Luftschrauben die mit ringartigen Kränzen versehen sind
English title Propellers with with ring-like wreaths
Tech fields
Filing date 1908-04-08
Full specification filed date
Application number
Grant date 1910-10-13
Granted? Yes
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number
Patent agent
Assigned to
National tech categories DE 77h.6
IPCs IPC B64C11/00
CPCs CPC B64C11/006
Family year 1908
First filing? Yes
Cites these patents
Citations from after 1930
Application ID
INPADOC family ID
Number of text pages 2
Number of diagram pages 1
Number of figures 2
Number of claims 2