Patents by Inventor Allan L. Backus

Allan L. Backus 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).

  • Retractable pen with self sealing writing tip opening
    Patent number: 5022773
    Abstract: A writing instrument having a retractable writing tip and hollow pliable seal with a closure pinched by a metal spring clip to seal the instrument's writing tip from contact with open air. The instrument may use writing tips, such as roller ball, fountain and felt tips, which employ volatile inks.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: June 11, 1991
    Inventors: Richard Waldinger, Allan L. Backus