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Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US395524010 Jul 197511 May 1976Firma Wilhelm Bahmuller, Maschinen- und ApparatebauMulti-position safety lock joint, particularly for folding ladders
US46453711 May 198624 Feb 1987Safety joint mechanism, particularly for folding ladders
US465550125 Jul 19857 Apr 1987NHK Spring Co., Ltd.
Ikeda Bussan Co. Ltd.
Armrest of a seat
US477350311 Sep 198727 Sep 1988Robert L. Pease
Kenneth T. Feeser
Ladder hinge
US49344858 Feb 198819 Jun 1990Robert Pease
Kenneth Feeser
Combination ladder and hand truck
US502211825 Jun 199011 Jun 1991Wan Dean Industry Co.Ladder joint with engagement spring member
US505823914 Apr 198622 Oct 1991Alfa Metal Corp.Fixing knuckles in foldable aluminum ladder
US539301810 Nov 199328 Feb 1995Deutsche Aerospace AGUnfolding and locking joint for space elements
US56476016 Feb 199515 Jul 1997Collapsible infant stroller adapter
US56996985 Mar 199623 Dec 1997Aerospatiale Societe Nationale IndustrielleSystem for extending or retracting two members and cam-locking the members in the extended position
US687758625 Sep 200312 Apr 2005Sylmark Holdings LimitedHinge system for combination hand truck, step ladder and dolly device
US688083511 Apr 200319 Apr 2005Sylmark Holdings LimitedCombination hand truck, step ladder and dolly
US700384929 Oct 200328 Feb 2006Fulcrum Sports, Inc.Self locking hinge
US73408019 Oct 200311 Mar 2008Sugatsune Kogyo Co., Ltd.Stay
US80627185 Apr 201022 Nov 2011Invertible christmas tree