Patents by Inventor Nelson Severinghaus, Jr.

Nelson Severinghaus, Jr. 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).

  • Method of bleaching limestone
    Patent number: 4824653
    Abstract: A method for improving the brightness of limestone utilizing a chelating agent and a bleaching agent in a limestone slurry in which the pH of the slurry is normally between 9.0 and 9.6.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: April 25, 1989
    Assignee: Franklin Industries, Inc.
    Inventors: Nelson Severinghaus, Jr., Gregory R. Sharp
  • Method of tinting a mineral filler
    Patent number: 4661164
    Abstract: A method of increasing the whiteness of a mineral filler, such as limestone, having a natural yellow tint, including the grinding of the limestone to a pulverulent size and introducing into the limestone, preferably while it is being ground, a blue pigment in an amount sufficient to optically transform the natural yellow tint to a predetermined degree of whiteness.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: April 28, 1987
    Assignee: Franklin Industries, Inc.
    Inventor: Nelson Severinghaus, Jr.