The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 1976
Filed:
Apr. 19, 1974
Zvi Weinberger, Jerusalem, IL;
Avram Kalisky, Jerusalem, IL;
Other;
Abstract
A method and device for the comparison of patterns, and especially of fingerprints, making possible the identification of a given person. The device comprises means for projecting an incoherent image of the finger to be compared onto a permanent fingerprint record, oscillating same with respect to each other, projecting the resulting image onto a photocell and ascertaining the A.C.-current characteristics of the resulting electrical signal. When the finger is positioned exactly, oscillation in one direction is adequate, if not oscillations in at least two directions are to be resorted to. The image of the finger is advantageously obtained by frustrated total reflection on the totally reflecting face of a prism. The permanent record and the image may be subjected to a predetermined distortion and/or magnification according to a predetermined code, reducing the risk of forgeries.