Resources Contact Us Home
Security device based on customized microprism film

Image Number 15 for United States Patent #7903308.

A security device comprises at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets. Each region forms a reflector due to total internal reflection when viewed at least one first viewing angle and is transparent when viewed at at least one second viewing angle. The said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region.

  Recently Added Patents
3G LTE intra-EUTRAN handover control using empty GRE packets
Compositions comprising nanomaterials and method for using such compositions for histochemical processes
Packaged semiconductor chips
Conversion of acyclic symmetrical olefins to higher and lower carbon number olefin products
Photochromic dichroic naphtho-pyrans and optical articles containing them
Reusable pulse oximeter probe and disposable bandage apparatii
Wavelength division multiplexing network path search method and system
  Randomly Featured Patents
Semiconductor light-emitting device including a divided electrode having a plurality of spaced apart conductive members
Image forming apparatus, operation-screen updating method, and computer program product
Enhanced boron nitride composition and compositions made therewith
Underwater viewing apparatus
Microorganism antigen extraction methods
Waste-free method of making molding powder
Four state DC motor controller
Anti-CD40 antibodies capable of blocking B-cell activation
Adjustable chair arrangement
Scanning electron microscope having a monochromator