Patents by Inventor Robert C. Hertel

Robert C. Hertel 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).

  • Damper frame construction
    Patent number: 4446667
    Abstract: A one-piece damper frame wherein transverse slots in a channel shaped longitudinal frame member permit the frame sections to be bent to define a frame opening and flanges integral with the channel are unsevered to provide continuous integrity throughout the frame perimeter. Tabs formed in the frame material by extensions of the transverse slots overlap the proximal frame section across the corner and are secured in a manner to rigidly hold the corners in their appropriate angled positions.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: May 8, 1984
    Assignee: Ruskin Manufacturing Company
    Inventor: Robert C. Hertel