Patents by Inventor Ronald H. van de Merwe

Ronald H. van de Merwe 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).

  • Alumina sol-gel fiber
    Patent number: 5514631
    Abstract: An alumina based ceramic fiber having submicron sized alpha alumina crystals and a density of at least 95% theoretical is obtained from a sol-gel process.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: May 7, 1996
    Assignee: Norton Company
    Inventors: Thomas E. Cottringer, Ronald H. van de Merwe, Ralph Bauer, Walter A. Yarbrough
  • Abrasive material and method
    Patent number: 5395407
    Abstract: The hardness and microstructure of aluminous abrasives produced from alumina gels are enhanced by introduction of seed material as by wet vibratory milling of the material with alumina media, or by the direct addition of very fine alpha alumina particles in the amount of 1% or less.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: March 7, 1995
    Assignee: Norton Company
    Inventors: Thomas E. Cottringer, Ronald H. van de Merwe, Ralph Bauer, Walter A. Yarbrough
  • Abrasive material and method
    Patent number: 5383945
    Abstract: The hardness and microstructure of aluminous abrasives produced from alumina gels are enhanced by introduction of seed material as by wet vibratory milling of the material with alumina media, or by the direct addition of very fine alpha alumina particles in the amount of 1% or less.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: January 24, 1995
    Assignee: Norton Company
    Inventors: Thomas E. Cottringer, Ronald H. van de Merwe, Ralph Bauer, Walter A. Yarbrough
  • Sintered sol gel alumina abrasive filaments
    Patent number: 5244477
    Abstract: A process is described for the production of bonded abrasive products in which the abrasive particles are filamentary alumina particles with a substantially uniform cross-section and an aspect ratio of at least about 1:1.
    Type: Grant
    Filed: September 4, 1992
    Date of Patent: September 14, 1993
    Assignee: Norton Company
    Inventors: Charles V. Rue, Ronald H. van de Merwe, Ralph Bauer, Scott W. Pellow, Thomas E. Cottringer, Richard J. Klok
  • Sintered sol gel alumina abrasive filaments
    Patent number: 5194072
    Abstract: A filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
    Type: Grant
    Filed: May 2, 1990
    Date of Patent: March 16, 1993
    Assignee: Norton Company
    Inventors: Charles V. Rue, Ronald H. van de Merwe, Ralph Bauer, Scott W. Pellow, Thomas E. Cottringer, Richard J. Klok
  • Sintered sol gel alumina abrasive filaments
    Patent number: 5009676
    Abstract: A filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: April 23, 1991
    Assignee: Norton Company
    Inventors: Charles V. Rue, Ronald H. van de Merwe, Ralph Bauer, Scott W. Pellow, Thomas E. Cottringer, Richard J. Klok
  • Abrasive material and method for preparing the same
    Patent number: 4623364
    Abstract: The hardness and microstructure of aluminous abrasives produced from alumina gels are enhanced by introduction of seed material as by wet vibratory milling of the material with alumina media, or by the direct addition of very fine alpha alumina particles in the amount of 1% or less.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: November 18, 1986
    Assignee: Norton Company
    Inventors: Thomas E. Cottringer, Ronald H. van de Merwe, Ralph Bauer