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  • US 3,947,128 A
  • Filed: 04/19/1974
  • Issued: 03/30/1976
  • Est. Priority Date: 04/19/1974
  • Status: Expired due to Term
First Claim
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1. A device for the comparison of the image of a given member and of a permanent record of said member, comprising in combination an optical modification in the permanent record of said member, the optically modified record including a predetermined significantly distorted geometrically dissimilar image of said member, means for projecting an image of said member onto the optically modified permanent record of said member and including means for providing a corresponding optical modification in the projected image, means for oscillating said record with respect to said projected image, means for projecting the image resulting from the oscillation of said record with respect to said projected image onto a photoelectric device and means for detecting a predetermined A.C. fluctuation in the electric current from said photoelectric device.

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