Patents by Inventor Roy Simpson

Roy Simpson 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).

  • Patent number: 4377850
    Abstract: A self-contained, hand-held measuring device utilizing a roller mounted on a miniature electronic calculator to actuate the "constant" integrating circuit as the roller rolls along a surface to be measured. The calculator keyboard is usable to make and display various calculations using the results of measured distances, as well as for calculating purposes generally.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: March 22, 1983
    Inventor: Roy Simpson