Patents by Inventor William K. Leonard

William K. Leonard 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).

  • Roll gap controller for regulating coating thickness
    Patent number: 5409732
    Abstract: A method for regulating the thickness of an applied coating. The method includes passing a web through two members which define a gap between them. A sensor measures periodic variations in the thickness of the coating on the web. An automatic controller analyzes information from the sensor and converts the information into gap adjusting signals. Piezoelectric or magnetostrictive translators adjust the size of the gap to compensate for repeating variations in coating thickness.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: April 25, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William K. Leonard, Stephen W. Mohn, P. Daniel Schiller
  • Method and apparatus for extruding bingham plastic-type materials
    Patent number: 5304331
    Abstract: The present invention relates to an apparatus and method for extruding a Bingham plastic-type material through a die having an auger rotationally mounted therein.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: April 19, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William K. Leonard, Donley D. Rowenhorst, Jerald A. Scherger, Donald R. Winberg
  • Shaped abrasive particles and method of making same
    Patent number: 5201916
    Abstract: A method of making abrasive particles having a specified shape and abrasive articles containing abrasive particles having a specified shape.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: April 13, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Todd A. Berg, Donley D. Rowenhorst, James G. Berg, William K. Leonard