×

Anticopying film

  • US 5,795,643 A
  • Filed: 02/13/1995
  • Issued: 08/18/1998
  • Est. Priority Date: 10/29/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. An anticopying film, consisting of a film of transparent material having a large number of nontransparent or reflecting layers which are arranged essentially equal distances apart and whose planes are arranged essentially parallel to one another and in about the same predetermined position relative to the surfaces of the film on at least one of the surfaces, wherein from a predetermined oblique viewing through angle from about 30°

  • to about 73°

    onto the surfaces of the anticopying film, the latter is essentially transparent and, and wherein the nontransparent or reflecting layers are formed at least partially from exposed photosensitive material and the nontransparent or reflecting layers are located on the upper and lower surfaces of the anticopying film and are arranged obliquely relative to the surface of anticopying film as to provide for said predetermined oblique viewing angle.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×