Patents by Inventor Herbert L. Warren

Herbert L. Warren 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).

  • Paper-backed acoustical tile
    Patent number: 4016234
    Abstract: An acoustical tile comprising a relatively thin, flat body of acoustical composition including fibrous material and a binder, and a paper backing affixed thereto having a fire-retardant material dispersed therein, the outer facing surface of the tile being either planar or slightly convex.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: April 5, 1977
    Assignee: United States Gypsum Company
    Inventors: Herbert L. Warren, Bruce A. Wittrup
  • Paper-backed acoustical tile
    Patent number: 4010817
    Abstract: An acoustical tile comprising a relatively thin, flat body of acoustical composition including fibrous material and a binder, and a paper backing affixed thereto having a fire-retardant material dispersed therein, the outer facing surface of the tile being either planar or slightly convex.
    Type: Grant
    Filed: May 20, 1974
    Date of Patent: March 8, 1977
    Assignee: United States Gypsum Company
    Inventors: Herbert L. Warren, Bruce A. Wittrup