Patent DE-1891-59851

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The original document is available at the Lilienthal museum site.[1]

There are two archive records of this patent at the Lilienthal museum. Both refer with a misspelling to inventor "Steward Cairncross" and one refers by incorrect number 598551.[2][3]

The German version is significantly abbreviated compared to the American, but uses the same illustrations.

Inventor location: Grafton, Walsh county, North Dakota, U.S.


  1. Original patent doc at Lilienthal museum patents
Year filed 1890
Year granted 1891
Office DE
Patent number 59851
Inventors Stewart Cairncross
Inventor country US
Applicant person Stewart Cairncross
Applicant firm
Applicant type INDIV
Applicant is inventor? Yes
Original title Lenkbares Luftschiff
English title Steerable airship
Tech fields Drachenflieger, LTA, navigation, propulsion, parachute, propeller, balloon, piloting, ascension
Filing date July 22, 1890
Full specification filed date
Application number
Grant date November 21, 1891
Granted? Yes
Publication date
Supplementary to patent Patent DE-1890-59851
Related to aircraft? Yes
Serial number
Patent agent
Assigned to
National tech categories DE 77
CPCs CPC B64C2700/6273, CPC B64C23/005
Family year 1890
First filing? Yes
Number of citations
Cited by
Application ID 9352998
Number of text pages 2
Number of diagram pages 1
Number of figures 4
Number of claims 1