Dynamic Hydraulic Systems, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4848085 Oil-well pumping system or the likeExpiredFeb 23, 88Jul 18, 89[F16H]
4801126 Hydraulically operated lift mechanismExpiredFeb 24, 87Jan 31, 89[B66F]
4761953 Hydraulic elevator mechanismExpiredDec 24, 86Aug 09, 88[F16D]
4761954 Fork-lift systemExpiredMar 16, 87Aug 09, 88[F16D]
4730743 Hydraulically operated bridge craneExpiredDec 15, 86Mar 15, 88[B66C]
4715180 Hydraulic lift mechanismExpiredApr 18, 84Dec 29, 87[F16H]
4702076 Hydraulically operated clam-shell deviceExpiredJul 23, 84Oct 27, 87[F16H]
4686828 Hydraulically operated clamshell deviceExpiredOct 11, 85Aug 18, 87[F16D]
4665696 Hydraulically operated hoist for containerized freight or the likeExpiredOct 18, 84May 19, 87[F16D]
4631918 Oil-well pumping system or the likeExpiredDec 21, 84Dec 30, 86[F16H]

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