Patents by Inventor John W. Maddocks

John W. Maddocks has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Instructional printing equipment
    Patent number: 4685885
    Abstract: Instructional printing equipment for teaching the correct manner of printing letters and/or numerals includes a set of letters and/or numerals each formed as a block with at least one groove forming the configuration of a letter or numeral concerned. Each groove has a surface shaped to facilitate movement of a writing instrument along the groove in a preferred direction to be used when writing the letter or numeral concerned and to resist the movement of the writing instrument therealong in an opposite direction.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: August 11, 1987
    Inventor: John W. Maddocks
  • Animal feeder
    Patent number: D331132
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: November 17, 1992
    Inventor: John W. Maddocks