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:
May. 16, 1995
Filed:
Sep. 10, 1993
Thomas F Sartor, Jr, Sunnyvale, CA (US);
Indentix Incorporated, Sunnyvale, CA (US);
Abstract
An apparatus for imaging a finger so as to produce a fingerprint image free of artifacts created by moisture on the finger. An optical platen having a surface for receiving the finger to be imaged is illuminated by a light source. A light detector is provided for receiving light from the platen surface which is internally reflected at the surface. A fingerprint image is formed by light which is internally reflected at the regions intermediate the finger ridges and absorbed/dispersed where the ridges contact the surface, The observation angle of the detector is sufficiently large so that moisture on a person's fingers does not affect the light which is internally reflected at the surface and detected. The resultant fingerprint image is free of artifacts attributable to moisture.