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
Automatic search system and method
Method and apparatus for detection of the remote origin fraction of radon present in a measuring site
Battery loading and unloading mechanism
Flow cytometer method and apparatus
System and method for multi-threaded MIMO OFDM channel equalizer
Modular authoring and visualization of rules using trees
Mobile camera localization using depth maps
  Randomly Featured Patents
Sole for athletic shoe
Method for rendering ligase-based amplification products unamplifiable
Circuit for producing pulses by differentiating output of sawtooth oscillator
3-Aminoindazole-1 and 2-carboxylic acid derivatives
Method for programming antifuses for reliable programmed links
Double-pedal double wheel caster
Exercise weight-lifting apparatus and improved carriage for same
Full-text relevancy ranking
Hairdye comb
Rotary, flat metallic fluid-tight and thrust-resisting seal and the method of manufacture thereof