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Class Information
Number: 33/122
Name: Geometrical instruments > Area integrators > Planimeters
Description: Area integrators having a tracing member designed to travel around the outline of the area to be determined, and frequently specially designed to determine effective pressure and horsepower from engine indicator diagrams.


Patents under this class:

Patent Number Title Of Patent Date Issued
7408838 Digitizing planimeter Aug. 5, 2008
6644814 LED-illumination-type DMD projector and optical system thereof Nov. 11, 2003
6513257 Method and apparatus for determining scale in photographic images Feb. 4, 2003
5990809 Underwater surveying system Nov. 23, 1999
4754103 X-Y position indicator for a display system Jun. 28, 1988
4617740 Measuring device for a figure Oct. 21, 1986
4616419 Measuring device for a figure Oct. 14, 1986
 
 
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