Patents by Inventor Irvin F. Havens

Irvin F. Havens 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).

  • Vitrified bonded abrasive tools
    Patent number: 6702867
    Abstract: The present invention provides a vitrified-bonded abrasive tool wherein the abrasive grit portion comprises a thermally sensitive abrasive grain, such as sintered sol gel microcrystalline alpha alumina abrasive grain or superabrasive grain, and wherein the vitrified bond may be matured by firing at a temperature of about 700 to 1,100 ° C. The invention preferably is carried out with sintered sol gel microcrystalline alpha alumina abrasive grain and a phosphorous oxide-containing, alkaliborosilicate vitrified bond composition. In one embodiment, during firing at about 700 to 1,100 ° C., the vitrified bond of the invention comprises at least two immiscible, amorphous phases.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: March 9, 2004
    Assignee: Saint-Gobain Abrasives Technology Company
    Inventors: Lee A. Carman, Irvin F. Havens, Wesley A. King
  • Vitrified bonded abrasive tools
    Publication number: 20030205003
    Abstract: The present invention provides a vitrified-bonded abrasive tool wherein the abrasive grit portion comprises a thermally sensitive abrasive grain, such as sintered sol gel microcrystalline alpha alumina abrasive grain or superabrasive grain, and wherein the vitrified bond may be matured by firing at a temperature of about 700 to 1,100 ° C. The invention preferably is carried out with sintered sol gel microcrystalline alpha alumina abrasive grain and a phosphorous oxide-containing, alkaliborosilicate vitrified bond composition. In one embodiment, during firing at about 700 to 1,100 ° C., the vitrified bond of the invention comprises at least two immiscible, amorphous phases.
    Type: Application
    Filed: September 10, 2002
    Publication date: November 6, 2003
    Inventors: Lee A. Carman, Irvin F. Havens, Wesley A. King