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
Electrical terminal
Substituted thiophene pentamers
Triazine ring-containing polymer and film-forming composition comprising same
Wire guide
Methods and systems for optimizing data accesses
Systems and methods for DC-to-DC converter control
Measurement system service for a vehicle instrument panel
  Randomly Featured Patents
Information signal encoding apparatus, encoding method thereof, information signal decoding method, and information signal medium thereof
Electronic control apparatus
Patient care equipment transfer between hospital bed and architectural system
Beverages
Spacer element for prosthetic and orthotic devices
Foamed core products and method
Ring cavity type surface emitting semiconductor laser and fabrication method thereof
PMDC motor
Oscillator circuit
Method to achieve STI planarization