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
Doherty amplifier circuit
Synchronization of sound generated in binaural hearing system
Apparatus and method for connection control with media negotiation successful on different media formats
Signal processing apparatus, display apparatus having the same, and signal processing method
System and method for displaying relationships between electronically stored information to provide classification suggestions via inclusion
Automatic adjustment of devices in a home entertainment system
Register files for a digital signal processor operating in an interleaved multi-threaded environment
  Randomly Featured Patents
Communication system and method
Vehicle safety systems and methods
Aspiration-type sprayer
Golf club head with peripheral weighting
Propellant material
Digital filter, servo control unit, and disk drive
Voltage limited ballast for gaseous discharge devices
3-position 3-way solenoid valve
Air operated liquid pump
Potted lamp socket