Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Educational and amusement apparatus










Image Number 2 for United States Patent #4428732.

An educational and amusement device includes elements in the form of an alphabet and/or the digits of a numbering system. Each character element is similarly divided by a plurality of essentially similar parallel lines, which may consist of a first set of parallel lines alone or first and second sets, with the second set of parallel lines oriented to extend in an opposite and perpendicular direction from such first set of lines. Each element includes at least three parts but less than ten, and preferably is four or five parts for sufficient complexity to maintain interest of a child or other person having a learning disability but of a sufficient simplicity to prevent frustration. Each element may be formed with the parts releasably interconnected with each other as by water soluble adhesive. Each element can be made progressively more complex.








 
 
  Recently Added Patents
Cooling method and device for cooling a medium-voltage electrical installation in a protective sheath
Brushless electric motor or generator in shell construction
Mobility management in a communications system
Process for the preparation of diene polymers of statistical vinylarene-diene copolymers
Off-line converter with digital control
Devices including composite thermal capacitors
System and method for browsing tabbed-heterogeneous windows
  Randomly Featured Patents
Stylus input capacitive touchpad sensor
Electrostatic image-developing toner, fine powdery titanium oxide, and hydrophobic fine powdery titanium oxide
Contrast delivery syringe with internal hydrophilic surface treatment for the prevention of bubble adhesion
Jetting method of liquid, jetting apparatus of liquid, production method of substrate for electro-optical apparatus and production method of electro-optical apparatus
Method for patterning metal using nanoparticle containing precursors
Method and system to reduce peak to average power ratio in multi-carrier modulation receivers
Producing a plasma containing beryllium and beryllium fluoride
Antiproliferative quinazolines
Emulsion type adhesive compositions
Liquid crystal display device