Patents by Inventor F. Joseph Ehrhardt

F. Joseph Ehrhardt 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).

  • Backing sheet for surface covering
    Patent number: 6875504
    Abstract: A stain-adsorbing backing sheet for use with a decorative surface covering; a decorative surface covering comprising a stain-adsorbing backing sheet; and a method for forming a stain-adsorbing backing sheet for a decorative surface covering. The backing sheet comprises an additive which is effective in adsorbing a stainant that comes into contact with the backing sheet and which is present in an amount effective to reduce the degree of staining which tends to be visible in the top surface of the covering. The additive is preferably an adsorbing material that does not affect adversely the visual characteristics of the sheet and surface covering.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: April 5, 2005
    Assignee: Congoleum Corporation
    Inventors: James M. Malloy, F. Joseph Ehrhardt
  • Backing sheet for surface covering
    Publication number: 20030109622
    Abstract: A stain-adsorbing backing sheet for use with a decorative surface covering; a decorative surface covering comprising a stain-adsorbing backing sheet; and a method for forming a stain-adsorbing backing sheet for a decorative surface covering. The backing sheet comprises an additive which is effective in adsorbing a stainant that comes into contact with the backing sheet and which is present in an amount effective to reduce the degree of staining which tends to be visible in the top surface of the covering. The additive is preferably an adsorbing material that does not affect adversely the visual characteristics of the sheet and surface covering.
    Type: Application
    Filed: July 24, 2002
    Publication date: June 12, 2003
    Inventors: James M. Malloy, F. Joseph Ehrhardt
  • Semibleaching liquor for Kraft paper products
    Patent number: 4731161
    Abstract: A process of preparing a bleaching liquor with an improved stability involves mixing of magnesium ions and hydrogen peroxide prior to the addition of sodium hydroxide. The liquor may be used to bleach Kraft wood pulps, obtaining higher brightness levels.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: March 15, 1988
    Assignee: Union Camp Corporation
    Inventor: F. Joseph Ehrhardt