Patents by Inventor Douglas Ritterling

Douglas Ritterling 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).

  • Folder with slide-stiffener assembly
    Patent number: 5618061
    Abstract: This folder (10) includes covered pocket portions (12, 14) connected by a spine (16) and each separately reinforced. The reinforcing for one portion (12) includes a slide-stiffener assembly (20) and the reinforcing for the other portion includes at least one stiffener (160, 260) separated from the slide-stiffener assembly (20). The slide-stiffener assembly (20) includes a base unit (22) housing a sliding extension member (40) which can be extended to bridge the spine (16) to hold the two pocket portions (12, 14) in an open position and provide a rigid writing surface and retracted to permit the folder (10) to be folded for storage by the user.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: April 8, 1997
    Assignee: American Trading and Production Corporation
    Inventor: Douglas Ritterling
  • Refrigerator door shelf
    Patent number: D344739
    Type: Grant
    Filed: December 1, 1992
    Date of Patent: March 1, 1994
    Assignee: White Consolidated Industries, Inc.
    Inventors: Robin Edman, Charles D. Baker, Douglas Ritterling
  • Refrigerator crisper drawer
    Patent number: D358403
    Type: Grant
    Filed: January 12, 1993
    Date of Patent: May 16, 1995
    Inventors: Robin Edman, Charles D. Baker, Douglas Ritterling
  • Steno work center providing a holder for a notebook and other articles
    Patent number: D410492
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: June 1, 1999
    Assignee: American Trading and Production Corporation
    Inventor: Douglas Ritterling