Assignee
EFFICIENCY PRODUCTION INC
9 granted patents·209 citations·filing 1976–1996
Top patents by PatentIndex Score
9 records- 0193US4259028AWater and debris impermeable trench box panelEFFICIENCY PRODUCTION INC·Filed 1978·Granted Mar 31, 1981·76 cites·8 claims
- 0271US4202649AFront plate for trench boxesEFFICIENCY PRODUCTION INC·Filed 1978·Granted May 13, 1980·28 cites·4 claims
- 0369US4090365APortal frame for trench box stackEFFICIENCY PRODUCTION INC·Filed 1976·Granted May 23, 1978·23 cites·5 claims
- 0464US5735642ATrench shield handling assemblyEFFICIENCY PRODUCTION INC·Filed 1996·Granted Apr 7, 1998·23 cites·3 claims
- 0563US4114383APortal frame for trench box stackEFFICIENCY PRODUCTION INC·Filed 1978·Granted Sep 19, 1978·19 cites·2 claims
- 0652USD399724STrench shield stacking bracketEFFICIENCY PRODUCTION INC·Filed 1996·Granted Oct 20, 1998·9 cites·1 claims
- 0751US5839707ATrench shield stacking deviceEFFICIENCY PRODUCTION INC·Filed 1996·Granted Nov 24, 1998·20 cites·2 claims
- 0837USD417764STrench shield handling assemblyEFFICIENCY PRODUCTION INC·Filed 1996·Granted Dec 14, 1999·4 cites·1 claims
- 0932US4425072AMaterial handling equipment extension apparatus for wrecking and the likeEFFICIENCY PRODUCTION INC·Filed 1981·Granted Jan 10, 1984·7 cites·19 claims
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