Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Electrical conduit containing a fire-resisting thermoplastic composition
Laminar library screen
System and method for detecting deadlock in a multithread program
Automated dynamic differential data processing
Mobile interactive kiosk method
Memory with separate read and write paths
Image forming apparatus having exhaust fan
  Randomly Featured Patents
Barrel cam loader arm assembly
Roof latch mechanism
Multi-stage mast for a forklift truck
Methods and apparatus for reducing radio frequency emissions in fluorescent light lamps
Stalling CPU pipeline to prevent corruption in trace while maintaining coherency with asynchronous events
Structure and method for repair of sheetrock walls
Combination utility knife and staple remover
Cluster structured mobile communication system base station, cluster control station, line control station and mobile station
Column mounted switching device
Register file circuitry