Kabushiki Kaisha Seidenko

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5153914 Sound equipment systemExpiredDec 28, 90Oct 06, 92[H03G]
5140301 Guidance method and apparatus in case of emergency evacuationExpiredSep 19, 89Aug 18, 92[G08B]
D320020 SpeakerExpiredNov 24, 89Sep 17, 91[]
4860369 Flat speaker unitExpiredApr 09, 87Aug 22, 89[H04R]

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