Resources Contact Us Home
Tamperproof reusable bingo card

Image Number 2 for United States Patent #4483538.

A translucent intermediate sheet having a standard array of bingo numbers is sandwiched between transparent top and bottom sheets. Alterations to the card, such as by a cheater, to permit changing, adding or rearranging bingo numbers can be seen through the sheets.

  Recently Added Patents
Measurement and uses of oxidative status
Information display
MEMS autofocus actuator
Methods for the production of aligned carbon nanotubes and nanostructured material containing the same
Multi charged particle beam writing apparatus and multi charged particle beam writing method
Femtocell one-to-many packet delivery
Social community generated answer system with collaboration constraints
  Randomly Featured Patents
Multimode voltage regulator and method for providing a multimode voltage regulator output voltage and an output current to a load
Device for adjusting the forcibly coupled seat and back of a dentist chair
Lean burn internal combustion engine
Static semiconductor memory device
Photosensitive film assembly having reflective support
Multi-sectional applicator
Autogenic living scaffolds and living tissue matrices: methods and uses thereof
Distributed feedback semiconductor laser
Equipment for aligning liquid crystals and method of transporting a plurality of substrates through liquid crystal aligning equipment
Class of Chloroflexi-like thermophilic cellulose degrading bacteria