Resources Contact Us Home
Tamperproof reusable bingo card

Image Number 4 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
Locking flange
Multi-level integrated circuit, device and method for modeling multi-level integrated circuits
System and method for broadcasting rich media to devices over multiple carriers
Computer device with digitizer calibration system and method
Air scent dispenser
Programming of DIMM termination resistance values
Hydrogen generation device and fuel cell system
  Randomly Featured Patents
Polyolefin-based articles printed by means of inks for PVC and processes for their manufacture
Interrupt request controller for data processing system
Pulse MIG welder for welding thin-walled copper-nickel pipe
Optical communications systems, devices, and methods
Control apparatus of audio-visual display apparatus and the control method
Pharmaceutical composition for inhibiting the growth of viruses and cancers
Tractor and baler interaction system
Glazed ceramic substrate
Automobile body
Immobilized enzymes for use in an electrochemical sensor