Device for ultrasonic identification of fingerprints
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United States of America Patent
Stats
-
Oct 8, 1996
Grant Date -
N/A
app pub date -
Dec 29, 1994
filing date -
Apr 30, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for identifying fingerprints by use of ultrasound having an electronic evaluating circuit, a hollow cylinder of length L with a cover and a base plate, wherein the ultrasonic speed through the liquid equals c' and the cover is made from a material with ultrasonic speed c'. The outer side of the cover is planar to serve as a supporting surface for the fingerprint. The inner side is either convex (c'>c') or concave (c'
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