Resources Contact Us Home
Security device based on customized microprism film

Image Number 12 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
Bull stationery tab
Proton conducting electrolytes with cross-linked copolymer additives for use in fuel cells
Method of and apparatus for recording motion picture, which generate encoded data with higher compression efficiency using a motion vector similarity
Pre-colored methodology of multiple patterning
Liquid composite compositions using non-volatile liquids and nanoparticles and uses thereof
Financial transaction cards
Client network device and method for adjusting parameters of client traffic windows based on discovery of other network devices
  Randomly Featured Patents
Window scraper
Gravity fed automatic rotary vein dispenser
Mixed aluminum hydroxide powder
Structural system for inclining sailboat masts to windward
Bicycle crank axle assembly
Thrust bearing made of synthetic resin
Board conveying apparatus and operation performing system
Method of transferring data with offsets
Miniature electric motor having bearing unit
Hydraulically actuated control system for use in a subterranean well