Patents by Inventor Dwight E. Johnson

Dwight E. Johnson 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).

  • Apparatus for the production of mineral fibers having supplemental collection chamber exhaust
    Patent number: 4576620
    Abstract: An apparatus for the production and collation of mineral fibers, comprising an air fiberization apparatus for generating mineral fibers, a collection chamber for collecting the fibers produced, and a cyclone type air exhaust apparatus connected by a duct to an upper portion of the collection chamber, the exhaust apparatus reducing the air pressure generated within the collection chamber thereby increasing the efficiency of fiber collection, and means for returning mineral fibers escaping from the collection chamber through the cyclone exhaust apparatus to the main fiber discharge position.
    Type: Grant
    Filed: December 4, 1984
    Date of Patent: March 18, 1986
    Assignee: United States Gypsum Company
    Inventors: William F. Porter, Michael J. Porter, Dwight E. Johnson