Patents by Inventor Ernest A. Pearson

Ernest A. Pearson 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).

  • Doorbar system
    Patent number: 3980328
    Abstract: Improvement in a doorbar device for barring the door of a doorway, the doorway having doorjambs and a door therefor, the door having a doorknob, the doorbar device comprising a doorknob constructed to be affixed to the doorjambs of the doorway to extend across and bar the door from being opened, the doorbar device also comprising a mechanism for applying a force upon the doorknob to prevent turning thereof.
    Type: Grant
    Filed: May 21, 1975
    Date of Patent: September 14, 1976
    Assignee: Robert J. Pearson
    Inventor: Ernest A. Pearson