Patents by Inventor Robert K. Rangell

Robert K. Rangell 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).

  • Water proof chalk line compositions for use with chalk line devices
    Patent number: 6203602
    Abstract: A water proof chalk line compositions for use with chalk line devices for snapping guide lines on wet surfaces that will not wash away when precipitation such as rain falls thereon. The water proof chalk line compositions for use with chalk line devices includes an effective amount of colored chalk mixed with an effective amount of concrete dye and applied to a moistened snap line of a chalk line device.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: March 20, 2001
    Inventor: Robert K. Rangell