Yamada Yuki Seizo Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5120202 Switching device for reciprocating pumpsExpiredJul 03, 90Jun 09, 92[F01L, F04B]
5002468 Switching device for reciprocating pumpsExpiredJan 25, 89Mar 26, 91[F01L, F04B]
5002469 Switching device for reciprocating pumpsExpiredMar 13, 90Mar 26, 91[F01L, F04B]
4923168 Spool type switching valve deviceExpiredJan 31, 89May 08, 90[F16K]
4817503 Diaphragm pump with pressure chamber having a ribbed wallExpiredNov 30, 87Apr 04, 89[F04B]
4188170 Diaphragm pumpExpiredApr 13, 78Feb 12, 80[F04B]

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