Ranco Japan Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5690144 Directional control valve for switching the mode of operation in a heat transfer systemExpiredNov 03, 95Nov 25, 97[F16K]
5020771 Proportional control valveExpiredFeb 12, 90Jun 04, 91[F16K]
4966194 Four-way switching valve deviceExpiredMar 13, 90Oct 30, 90[F16K]

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