Patents by Inventor Donley D. Rowenhorst

Donley D. Rowenhorst 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).

  • Shaped abrasive particles and method of making same
    Patent number: 5984988
    Abstract: A method of making abrasive particles having a specified shape and abrasive articles containing abrasive particles having a specified shape.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: November 16, 1999
    Assignee: Minnesota Minning & Manufacturing Company
    Inventors: Todd A. Berg, Donley D. Rowenhorst, James G. Berg, William K. Leonard
  • Abrasive article containing shaped abrasive particles
    Patent number: 5366523
    Abstract: An abrasive article comprising a binder and abrasive grits, wherein the abrasive grits comprise abrasive particles having specified shapes. Coated abrasive articles of this invention comprise a backing having at least one layer of abrasive material adhered thereto by means of a binder. A portion of this layer contains abrasive particles having specified shapes. It is preferred that the geometric shape of these abrasive particles be triangular. For triangular-shaped particles, about 35% to about 65% of the particles are oriented with a vertex pointing away from the backing and a base in contact with the binder, with about 35% to about 65% of the particles being oriented with a base pointing away from the backing and a vertex in contact with the binder.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: November 22, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donley D. Rowenhorst, Todd A. Berg
  • 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
  • Granular silicon carbide abrasive grain coated with refractory material, method of making the same and articles made therewith
    Patent number: 4505720
    Abstract: Improved granular abrasive material comprises silicon carbide particles at least partially coated with an integral, durable surface layer of a hard refractory material comprising metal nitride or carbide. Hard refractory materials which provide a useful coating include, for example, silicon nitride or carbide, titanium nitride or carbide, sialon, and others. The surface layer is preferably provided by chemical vapor deposition, most preferably utilizing a fluidized bed. The improved granular abrasive material is particularly useful in various abrasive products such as coated abrasive products, nonwoven abrasive products and abrasive grinding wheels.
    Type: Grant
    Filed: June 29, 1983
    Date of Patent: March 19, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas Gabor, David E. Broberg, Gunther H. Dierssen, Donley D. Rowenhorst
  • Abrasive article containing shaped abrasive particles
    Patent number: RE35570
    Abstract: An abrasive article comprising a binder and abrasive grits, wherein the abrasive grits comprise abrasive particles having specified shapes. Coated abrasive articles of this invention comprise a backing having at least one layer of abrasive material adhered thereto by means of a binder. A portion of this layer contains abrasive particles having specified shapes. It is preferred that the geometric shape of these abrasive particles be triangular. For triangular-shaped particles, about 35% to about 65% of the particles are oriented with a vertex pointing away from the backing and a base in contact with the binder, with about 35% to about 65% of the particles being oriented with a base pointing away from the backing and a vertex in contact with the binder.
    Type: Grant
    Filed: August 10, 1995
    Date of Patent: July 29, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Donley D. Rowenhorst, Todd A. Berg, David E. Broberg, James G. Berg