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It says filing date 1999 but publication date 2004

Publication number US6706023 B1 Publication type Grant Application number US 09/454,138 Publication date Mar 16, 2004 Filing date Dec 3, 1999 Priority date Dec 3, 1999 Fee status Paid

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USPTO Patent FAQ, PATENTS - Basic Process, How long does patent protection last? -

For applications filed on or after June 8, 1995, utility and plant patents are granted for a term which begins with the date of the grant and usually ends 20 years from the date you first applied for the patent subject to the payment of appropriate maintenance fees. Design patents last 14 years from the date you are granted the patent. Note: Patents in force on June 8 and patents issued thereafter on applications filed prior to June 8, 1995 automatically have a term that is the greater of the twenty year term discussed above or seventeen years from the patent grant.

Patent US 6706023 B1 has a filing date of Dec 3, 1999, which is after June 8, 1995. Patent protection would extend to 20 years from the filing date of Dec 3, 1999.

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