Patents by Inventor John G. Doelfel

John G. Doelfel 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: 5632678
    Abstract: A roof vent which is mounted on a roof to vent a clothes dryer. According to the roof vent, a screen is located to the outside of the vent and it is hinged thereto at a forward edge of the vent to completely enclose the space that is formed between the opening and the base plate of the vent. Because of this hinge, the screen may swing upwardly for easy cleaning. There is also a provision for locking the screen in its closed position to prevent rattling and to prevent dislodging by other forces, such as, animals or high winds.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: May 27, 1997
    Inventor: John G. Doelfel
  • Patent number: 4788723
    Abstract: A clip-on belt loop assembly for fastening onto the waistband of a garment having no integral belt loops. The assembly includes a rigid elongated flat base plate having near its upper end a flange projecting from the base plate, a belt loop made of flexible material such as leather or fabric, and a clip such as used to fasten suspenders to the waistband of a garment. The ends of the belt loop are riveted or otherwise fastened to the opposite ends of the base plate. The clip is fastened to the upper end of the base plate preferably by the same rivet used to fasten the upper end of the belt loop to the base plate.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: December 6, 1988
    Inventor: John G. Doelfel