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
Determination and presentation of package pricing offers in response to customer interest in a product
Integrated multi-sat LNB and frequency translation module
Potentiometric-sensor chip, potentiometric assay, and assay kit
High voltage circuit for electrical stimulation
Circuit arrangement having a load transistor and a voltage limiting circuit and method for driving a load transistor
Fishing apparatus
System and method for providing advice to consumer regarding a payment transaction
  Randomly Featured Patents
Switch control device for vehicle
Spring whip
Ductwork alignment tool
Capacitor ignition system
Impact modified thermoplastic copolyester
Sewing machine with a cooling system
Slider for slide fastener with locking device
Pyramidal microlens and camera lens structure using the same
Multi-purpose clamping device
Resistor insertion fuse