In reference to the patent: US6182594
Is this patent still valid ?
US6192594 was filed on Oct. 12th, 1999 and should expire 20 years from that date assuming all fees are kept up to date. The best site to confirm the status of US patents is the US Public Pair. I checked and the fees are paid and up to date so the patent should expire on Oct. 12th, 2019.