Apparatus for determining surface structures

Details Apparatus for determining surface structures Apparatus for determining surface structures

1994-03-30

1996-05-07

Voeltz, Emanuel T.

Boots, shoes, and leggings

364507, 364506, 73607, 73620, 12866101, 12866102, G01N 2400, G01N 2900, G01N 2918

Patent

active

055152988

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.

REFERENCES:
patent: 4530241 (1985-07-01), Crutzen et al.
patent: 4947351 (1990-08-01), Moran et al.
patent: 5062297 (1991-11-01), Hashimoto et al.
patent: 5117692 (1992-06-01), Moser
patent: 5235982 (1993-08-01), O'Donnell
patent: 5258922 (1993-11-01), Grill

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