Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Computer program, system, and method for mapping Social Security claiming strategies
Estrogen receptor ligands
Fluid handling structure, a lithographic apparatus and a device manufacturing method
Nut
Self cleaning rake
Touchscreen with Z-velocity enhancement
Voltage detection apparatus and combination circuit
  Randomly Featured Patents
Aircraft projector system and movement detection system responsive to aircraft structure movement
Pneumatic discharge apparatus for a stripping centrifuge
Webserver-based well instrumentation, logging, monitoring and control
Displacement sensor
Method and apparatus for reducing ambient noise effects in electronic monitoring instruments
Opposite-type wiper apparatus
(Hetarylphenoxy)-(phenylpiperazinyl)-propanols, their preparation and drugs containing these compounds
Vegetable peeler
Control device of a combustion apparatus
Scanning of moving objects using unique polygon mounted on carousel which rotates at twice polygon's speed