Patents

The following are lists of U.S. patents, current and expired, granted to Emmett Chapman.

Licensing inquires are welcome.

Current U.S. patents in good standing, granted to Emmett Chapman

Patent No. Date Issued Date filed Description
7,629,521 B1 Dec 8, 2009 Oct 14, 2008 "Divided Truss Rod"™, a "4-way"™ system in a single rod.
6,462,259 B1 Oct 8, 2002 Oct 30, 2000 "Flaps"™ Nut assembly for stringed musical instrument
6,452,077 B1 Sep 17, 2002 Feb 10, 2000 Disengagable string damper for a musical instrument (Ned Steinberger co-inventor)
6,369,306 B2 Apr 9, 2002 Dec 18, 2000 "Rails"™ fret system for stringed musical instruments
6,043,422 Mar 28, 2000 Feb 1, 1999 "The Block"® Compartmentalized pickup module for stringed musical instruments
5,285,710 Feb 15, 1994 Jun 29, 1992 Adjustable bridge for a stringed musical instrument


Expired U.S. patents, granted to Emmett Chapman

Patent No. Date issued Date filed Date expired Description
5,140,887 Aug 25, 1992 Sep 18, 1991 Aug. 25, 2009 Stringless fingerboard synthesizer controller
5,079,536 Jan 7, 1992 Mar 5, 1990 Jan. 7, 2009 Pressure transducer for musical instrument control
4,953,435 Sep 4, 1990 Jan 16, 1990 Sep. 4, 2007 Rear-access trussed neck construction for stringed musical instruments
4,922,797 May 8, 1990 Dec 12, 1988 May 8, 2007 Layered Voice musical self-accompaniment system
4,649,785 Mar 17, 1987 Apr 15, 1980 Mar. 17, 2004 Musical timbre modification method
4,633,754 Jan 6, 1987 Feb 19, 1986 Jan. 6, 2004 "Rods"™ fret system for stringed musical instruments
3,868,880 Mar 4, 1975 Apr 3, 1974 Mar 4, 1992 Melody 4ths with reversed bass 5ths tuning.
3,833,751 Sep 3, 1974 Feb 22, 1973 Sep 3, 1991 Belt hook and shoulder strap means of supporting stringed instrument, melody 4ths with reversed bass 5ths tuning.

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