Patents by Inventor Olivia D. Stewart

Olivia D. Stewart 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 producing acoustical fiberboard
    Patent number: 4190492
    Abstract: An improved method for producing acoustical fiberboard, which method comprises adding agglomerate articles formed from an aqueous composition comprising fiberboard dust, a glactomannan gum or glactomannan gum derivative, and a crosslinking agent to an aqueous fiberboard slurry, is disclosed. The resulting acoustical fiberboard exhibits excellent sound absorption.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: February 26, 1980
    Assignee: Armstrong Cork Company
    Inventors: Lewis W. Eckert, Olivia D. Stewart