utility patents are 20 years from issue date...

Patent number: 5491774...Comp General Corporation
Filing date: Apr 19, 1994
Issue date: Feb 13, 1996.......2016 - 2008 = 8 years

Patent number: 5787445...Norris Communications
Filing date: Mar 7, 1996
Issue date: Jul 28, 1998.........2018 - 2008 = 10 years

Patent number: 5839108...Norris Communications
Filing date: Jun 30, 1997
Issue date: Nov 17, 1998.......2018 - 2008 = 10 years

Patent number: 5842170...Norris Communications
Filing date: Dec 23, 1996
Issue date: Nov 24, 1998.......2018 - 2008 = 10 years

Patent number: 5742737...Norris Communications
Filing date: Mar 3, 1997
Issue date: Apr 21, 1998......2018 - 2008 = 10 years

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