Patents by Inventor J. Joseph Dugan

J. Joseph Dugan 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).

  • Counterweight door structure
    Patent number: 4516354
    Abstract: A counterweight door structure includes a door having a pair of upwardly extending arms for supporting counterweights at positions in spaced relation above the top edge of the door. The door is mounted for pivotal movement about a generally horizontal axis positioned closely adjacent the top edge of the door and the top edge of the door opening. The counterweight support arms are laterally spaced apart by a distance greater than the width of the building adjacent the door pivot axis to provide swinging clearance for the support arms when the door is pivoted upwardly 90.degree..
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: May 14, 1985
    Inventor: J. Joseph Dugan