Patents by Inventor David W. Susnitzky

David W. Susnitzky 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).

  • Silicon nitride/silicon carbide composite densified materials prepared using composite powders
    Patent number: 5643843
    Abstract: Prepare silicon nitride-silicon carbide composite powders by carbothermal reduction of crystalline silica powder, carbon powder and, optionally, crystalline silicon nitride powder. The crystalline silicon carbide portion of the composite powders has a mean number diameter less than about 700 nanometers and contains nitrogen. The composite powders may be used to prepare sintered ceramic bodies and self-reinforced silicon nitride ceramic bodies.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: July 1, 1997
    Assignee: The Dow Chemical Company
    Inventors: Stephen D. Dunmead, Alan W. Weimer, Daniel F. Carroll, Glenn A. Eisman, Gene A. Cochran, David W. Susnitzky, Donald R. Beaman, Kevin J. Nilsen
  • Method for producing silicon nitride/silicon carbide composite
    Patent number: 5538675
    Abstract: Silicon carbide/silicon nitride composites are prepared by carbothermal reduction of crystalline silica powder, carbon powder and optionally crsytalline silicon nitride powder. The crystalline silicon carbide portion of the composite has a mean number diameter less than about 700 nanometers and contains nitrogen.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: July 23, 1996
    Assignee: The Dow Chemical Company
    Inventors: Stephen D. Dunmead, Alan W. Weimer, Daniel F. Carroll, Glenn A. Eisman, Gene A. Cochran, David W. Susnitzky, Donald R. Beaman, Kevin J. Nilsen
  • Silicon nitride/silicon carbide composite powders
    Patent number: 5525556
    Abstract: Prepare silicon nitride-silicon carbide composite powders by carbothermal reduction of crystalline silica powder, carbon powder and, optionally, crystalline silicon nitride powder. The crystalline silicon carbide portion of the composite powders has a mean number diameter less than about 700 nanometers and contains nitrogen. The composite powders may be used to prepare sintered ceramic bodies and self-reinforced silicon nitride ceramic bodies.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 11, 1996
    Assignee: The Dow Chemical Company
    Inventors: Stephen D. Dunmead, Alan W. Weimer, Daniel F. Carroll, Glenn A. Eisman, Gene A. Cochran, David W. Susnitzky, Donald R. Beaman, Kevin J. Nilsen
  • SiAlON composites and method of preparing the same
    Patent number: 5413972
    Abstract: A dense, substantially glass free, SiAlON ceramic material and method of making such material. The material has at least an alpha-SiAlON phase and a beta-SiAlON phase and exhibits excellent high temperature oxidation resistance and strength, good room temperature toughness and hardness, and a density greater than at least 95 percent of theoretical. The method of making the ceramic material is simple and includes adding AlN in an amount sufficient to allow formation of a desired amount of alpha-SiAlON, and in addition, convert SiO.sub.2 and Al.sub.2 O.sub.3 into the beta-SiAlON phase, preferably, by adding AlN in an amount between about 1.3X+0.08Y-0.0045XY and about 1.3X+0.2Y-0.0024XY, wherein X is a weight percent of the SiO.sub.2 based on total weight of the Si.sub.3 N.sub.4 in the mixture and Y is a weight percent of alpha-SiAlON phase desired.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: May 9, 1995
    Assignee: The Dow Chemical Company
    Inventors: Chinmau J. Hwang, Donald R. Beaman, David W. Susnitzky