Patents by Inventor David A. Sheldon

David A. Sheldon 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).

  • Sol-gel alumina abrasive wheel with improved corner holding
    Patent number: 5573561
    Abstract: The present invention provides a vitreous-bonded abrasive grinding wheel wherein the abrasive grit portion comprises a sol-gel alumina abrasive and wherein the wheel has improved corner or form holding characteristics and mechanical properties. The invention further includes the bond composition which allows for improved corner or form holding and mechanical properties with sol-gel alumina abrasives.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: November 12, 1996
    Assignee: Norton Company
    Inventors: David A. Sheldon, Robert S. Lundberg, Xiaoming Li
  • Alumina abrasive wheel with improved corner holding
    Patent number: 5536283
    Abstract: The present invention provides a vitreous-bonded abrasive grinding wheel wherein the abrasive grit portion comprises an alumina abrasive and wherein the wheel has improved corner or form holding characteristics and mechanical properties. The invention further includes the bond composition which allows for improved corner or form holding and mechanical properties with alumina abrasives.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: July 16, 1996
    Assignee: Norton Company
    Inventors: David A. Sheldon, Robert S. Lundberg
  • Sol-gel alumina abrasive wheel with improved corner holding
    Patent number: 5401284
    Abstract: The present invention provides a vitreous-bonded abrasive grinding wheel wherein the abrasive grit portion comprises a sol-gel alumina abrasive and wherein the wheel has improved corner or form holding characteristics and mechanical properties. The invention further includes the bond composition which allows for improved corner or form holding and mechanical properties with sol-gel alumina abrasives.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: March 28, 1995
    Inventors: David A. Sheldon, Robert S. Lundberg, Xiaoming Li
  • High porosity vitrified bonded grinding wheels
    Patent number: 5203886
    Abstract: Vitrified bonded abrasive bodies prepared from sol-gel sintered aluminous grit particles, a vitreous bond, bubbled alumina, and a sacrificial organic material exhibit improved abrasive performance, especially for creepfeed grinding products.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: April 20, 1993
    Assignee: Norton Company
    Inventors: David A. Sheldon, Carole J. Markhoff-Matheny, Renato Terragni
  • Bonded abrasive products containing sintered sol gel alumina abrasive filaments
    Patent number: 5129919
    Abstract: Resinoid and vitrified bonded abrasive products containing filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
    Type: Grant
    Filed: May 2, 1990
    Date of Patent: July 14, 1992
    Assignee: Norton Company
    Inventors: Paul W. Kalinowski, Muni S. Ramakrishnan, Charles V. Rue, David A. Sheldon, Brian E. Swanson
  • Bonded abrasive products containing sintered sol gel alumina abrasive filaments
    Patent number: 5035723
    Abstract: Resinoid and vitrified bonded abrasive products containing filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: July 30, 1991
    Assignee: Norton Company
    Inventors: Paul W. Kalinowski, Muni S. Ramakrishnan, Charles V. Rue, David A. Sheldon, Brian E. Swanson