Patents by Inventor Robert D. MacDonald

Robert D. MacDonald 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).

  • Patent number: RE28786
    Abstract: 4. A hinge to pivotally connect a door to a frame in a manner such that the door will close tightly without a latch, said hinge comprising a first portion and a second portion, said first portion having a first flange, a first ear, and a connection between said flange and said ear, one of said portions being attachable to the frame and the other portion being attachable to the door, .Iadd.said connection between said first flange and said first ear being of sufficient length to space the hinged end of the door from the frame in the closed position of the door when the door has been pivotally connected to the frame, .Iaddend.said first portion being attachable along any part of said frame or said door, said second portion including a second flange, a second ear on one side of said second flange connected to said second flange, said first ear and said second ear being pivotally connected by a hinge pin, guide means extending from said second flange, a .Iadd.plunger .Iaddend..[.pressure member.].
    Type: Grant
    Filed: May 13, 1975
    Date of Patent: April 27, 1976
    Assignee: Cardinal of Adrian, Inc.
    Inventor: Robert D. MacDonald