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
Optimized control of an energy supplying system and an energy consuming system
Signal transfer apparatus
Calibration device and related method for phase difference between data and clock
Method and apparatus for sensing an input object relative to a sensing region of an ultrasound sensor device
Petunia plant named `Bartpet001`
System and method for redundant array copy removal in a pointer-free language
Sacrificial spacer approach for differential source/drain implantation spacers in transistors comprising a high-k metal gate electrode structure
  Randomly Featured Patents
Sealing lip device for a respiratory mask, respiratory mask and a method and a mould for producing the same
Toner, process cartridge and method of forming image
Feeder clamp
Process and apparatus for continuously loading pallets with ceramic articles
Alkali promoted manganese oxide compositions containing zirconium
Emulsion feed assembly and method
Pipe hanger
Peptides having ligand activities on APJ that is an orphan G protein-coupled receptor, and use thereof
Dual by-pass for diaphragm type flushometers
Folding structure for a folding chair