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
Adaptive switch mode LED system
Disk drive with a subset of sectors with reduced write-to-read gap
Error protection for pipeline resources
Lubricant supplying device, process cartridge, and image forming apparatus
System and method for internet based procurement of goods and services
System and method for the analysis of biodiesel
  Randomly Featured Patents
Apparatus and method for dimming function to control LED intensity
Intelligent retry method using remote shell
Modular marking architecture for wide media printing platform
Data-pattern induced skew reducer
Apparatus for removing water-soluble support material from one or more rapid prototype parts
Electronically-commutated motor
Dahlia plant named `Melody Bolero`
Dynamic control parameter adjustment in a power supply
Tree and post remover
Method for distributing service according to terminal type