Patents by Inventor Robert G. Spengler

Robert G. Spengler 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).

  • Publication number: 20080185225
    Abstract: A step ladder stabilizer for mounting behind the front step portion of a step ladder and having two adjusting legs which adjust as a slide moves vertically along a channel having a bracket at each end of the channel for attaching to the rear of the ladder steps. Within each of the steps is an adjustable extension leg used for various stability requirements. When not in use, the ladder stabilizer may be closed flush against the back of the ladder steps or it is easily removed from the step ladder.
    Type: Application
    Filed: April 4, 2008
    Publication date: August 7, 2008
    Inventor: Robert G. Spengler
  • Patent number: 7216742
    Abstract: A step ladder stabilizer for mounting behind the front step portion and having two adjusting legs which adjust as a slide lock moves vertically within a slot attached to the rear of the ladder steps. When not in use, the ladder stabilizer closes flush against the back of the ladder steps. An alternate embodiment includes a ladder stabilizer for an extension ladder comprising an extending leg and a stabilizer arm with the top of the extending leg attaching to a slide lock that slides along a channel mounted on the side of the ladder. Bolts passing through expansion inserts hold the channel onto each side of the ladder.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: May 15, 2007
    Inventor: Robert G. Spengler
  • Publication number: 20040134714
    Abstract: A step ladder stabilizer for mounting behind the front step portion and having two adjusting legs which adjust as a slide lock moves vertically within a slot attached to the rear of the ladder steps. When not in use, the ladder stabilizer closes flush against the back of the ladder steps. An alternate embodiment includes a ladder stabilizer for an extension ladder comprising an extending leg and a stabilizer arm with the top of the extending leg attaching to a slide lock that slides along a channel mounted on the side of the ladder. Bolts passing through expansion inserts hold the channel onto each side of the ladder.
    Type: Application
    Filed: January 15, 2003
    Publication date: July 15, 2004
    Inventor: Robert G. Spengler
  • Patent number: D353308
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: December 13, 1994
    Inventors: Robert G. Spengler, Paul Spengler