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
Large carrying case
Fractal method for detecting and filling data gaps within LiDAR data
Content display system
Information processing apparatus and display control method
Protective vest
Determination of copy number variations using binomial probability calculations
Method and apparatus for reducing power consumption used in communication system having time slots
  Randomly Featured Patents
Method of making cast-in-place prestressing concrete pile by means of movable casing set
System and method for reduction of information handling system power state transition of audible noise
Compounds for the treatment of addictive disorders
Organosilicone polymers and polyester urethane foam produced therewith
Run-of-mine coal separator
Floor lamp
Bi-directionally boosting and internal pressure trapping packing element system
Vacuum control system
Automatic adjustment method and system for servo motor circuit of a magnetic disk apparatus
Method for controlling an automatic transmission gear ratio shifts