Patent US-1914-1274622

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Aerial speedometer (measuring horizontal velocity) using a telescope to sight a particular point on the ground. The speed required to keep the object in sight, combined with a knowledge of altitude from barometer, can be used to calculate the velocity. This method is functionally the same as that disclosed in Patent US-1913-1123253, albeit with a different and perhaps more sophisticated apparatus.


Year filed 1914
Year granted 1918
Office US
Patent number 1274622
Inventors Elmer A. Sperry
Inventor country US
Applicant person
Applicant firm Sperry Gyroscope Company
Applicant type COMPANY+INDIV
Applicant is inventor? No
Original title Speed and Direction Indicator for Aircraft
English title Speed and Direction Indicator for Aircraft
Tech fields speedometer, instrument, subsystem, method, navigation
Filing date 1914/05/12
Full specification filed date
Application number
Grant date 1918/08/06
Granted? Yes
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number 828060
Patent agent Herbert H. Thompson
Assigned to Sperry Gyroscope Company
National tech categories UPSC 33/232
IPCs IPC G01P3/36
CPCs CPC G01P3/36
Family year 1914
First filing? No
Cites these patents
Citations from after 1930
Application ID
Number of text pages 6
Number of diagram pages 2
Number of figures 8
Number of claims 30