Apparatus for determining surface structures
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United States of America Patent
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-
May 7, 1996
Grant Date -
N/A
app pub date -
Mar 30, 1994
filing date -
Mar 30, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For determination of surface and special surface characteristics of an object, e.g. a fingerprint, the finger tip is placed on a convex surface of a support which is irradiated through a liquid or solid medium with spherical ultrasonic waves from a point source provided as a hole in a carrier for a ring of receiving transducers.
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