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
Magnetoresistive element and manufacturing method of the same
Sunglasses
System and method for enhanced artificial bandwidth expansion
Method and apparatus for allocating erasure coded data to disk storage
Method of generating integrated circuit model
Method for controlling a motor
Methods and systems for detecting icing conditions
  Randomly Featured Patents
Light
Sliding universal joint having a holder inclination restriction flange
Method and apparatus for locating a movable servo controlled member during position signal drop-out
Dual damascene interconnect structures having different materials for line and via conductors
2-amino-bicyclo (3.1.0) hexane-2,6-dicarboxylic ester derivative
Access control for digital video stream data
Apparatus, method and program for alarming abnormality in tire air-pressure
Sleeping bag with replaceable air mattress
Method for preparing flexible mechanically compensated transparent layered material
Educational devices