Patents by Inventor John E. Pfeiffer

John E. Pfeiffer 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).

  • Self-contained portable electrically sensed bathroom scale
    Patent number: 4258812
    Abstract: A portable bathroom scale is described wherein an optical encoder is used to determine the scale displacement in an unambiguous manner. A convenient circuit is used to transform the optical code on an encoder disc to the code needed to activate a decimal display. A mechanism is described for automatically activating the encoder and display when a person steps on the scale and deactivate the mechanism when the person steps off the scale.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: March 31, 1981
    Inventor: John E. Pfeiffer