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CAVITY IDENTIFICATION

  • US 3,745,314 A
  • Filed: 06/18/1971
  • Issued: 07/10/1973
  • Est. Priority Date: 06/18/1971
  • Status: Expired due to Term
First Claim
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1. A method for identifying the mold origin of non-opaque containers produced in a plurality of molds comprising the steps of:

  • a. molding identification indicia into each of said containers, unique for each of said plurality of molds, and having distinctive light scattering properties such that a projected image of the portion of said container on which said indicia appears presents a distinctive pattern of dark spots;

    b. moving a container to be identified as to its mold of origin into an identification station;

    c. illuminating said indicia of said container with a light beam at said identification station;

    d. projecting the light transmitted through said container onto an image plane to produce said distinctive pattern of dark spots on said image plane;

    e. electronically reading said pattern of dark spots oN said image plane to provide an output representative of said pattern of dark spots; and

    f. decoding said output to identify the mold of origin of said container.

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