Patents by Inventor William F. Appler

William F. Appler 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).

  • Plastic security handrail system and connectors therefor
    Patent number: 5303900
    Abstract: A plastic security handrail system made with lightweight, high strength, non-corrosive plastic pipe having a plurality of elongated spaced rails mounted between end supports. A plurality of individual coped sections are held together by a compression force to form center posts spaced from the end supports. The system includes coped fitting joint connectors for perpendicular connections between rails and posts and rabbeted joint connections for connecting various rail sections together to form a rigid, strong railing system for a wide variety of uses.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: April 19, 1994
    Inventors: James E. Zulick, III, William F. Appler