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Mask system for radiograph light box

  • US 4,775,918 A
  • Filed: 09/24/1987
  • Issued: 10/04/1988
  • Est. Priority Date: 09/24/1987
  • Status: Expired due to Fees
First Claim
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1. Apparatus for masking the edge regions of an area comprising:

  • at least one continuous belt having a width corresponding to the width of the area;

    a pair of rotatable rollers positioned at opposite sides of the area respectively for supporting said belt adjacent the area;

    said belt having spaced opaque sections of predetermined length and transparent sections connecting said opaque sections;

    said rollers being movable to move portions of said opaque sections into alignment with opposite edge regions of the area to mask the opposite edge regions.

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