Assignee
PORTEC INC
US46 patents
Top patents by PatentIndex Score
US4887708ADec 19, 1989
Drive apparatus for belt power turns
PORTEC INC37 citations92
US4776736AOct 11, 1988
Twin container hold down
PORTEC INC28 citations92
US4632308ADec 30, 1986
Adjustable rail fastener assembly
PORTEC INC28 citations92
US4430032AFeb 7, 1984
Pedestal container locking device
PORTEC INC34 citations91
US5394958AMar 7, 1995
Rail lubrication apparatus
PORTEC INC49 citations90
US5348120ASep 20, 1994
Rail lubrication apparatus
PORTEC INC27 citations90
US4451188AMay 29, 1984
Coil car with shiftable trough assemblies
PORTEC INC43 citations90
US5732827AMar 31, 1998
Screening apparatus
PORTEC INC29 citations89
US5484111AJan 16, 1996
Hammers for hammer mills
PORTEC INC23 citations89
US4084516AApr 18, 1978
Foldable slidable vehicle end enclosure
PORTEC INC31 citations89
US5598914AFeb 4, 1997
Removable sidewall for a molded spiral chute
PORTEC INC24 citations88
US4930621AJun 5, 1990
Attachments for power turns
PORTEC INC29 citations87
US4437410AMar 20, 1984
Pivotal slidable vehicle end enclosure
PORTEC INC46 citations87
US4037513AJul 26, 1977
Cotter pin
PORTEC INC34 citations86
US3996860ADec 14, 1976
Vehicle end enclosure
PORTEC INC38 citations84
US5294065AMar 15, 1994
Portable screening/dosing/mixing plant
PORTEC INC52 citations83
US4974215ANov 27, 1990
Loading dock range finding system
PORTEC INC25 citations83
US5394977AMar 7, 1995
Apparatus and method for use in replacing conveyor belts
PORTEC INC34 citations81
US4524314AJun 18, 1985
Rear travel guidance system
PORTEC INC24 citations81
US4726456AFeb 23, 1988
Braking system for a molded fiberglass spiral chute
PORTEC INC23 citations75
US4273052AJun 16, 1981
Spike driving apparatus
PORTEC INC23 citations74
US4263853AApr 28, 1981
Rail car end door positioning keeper assembly
PORTEC INC19 citations74
US4306677ADec 22, 1981
Rail fastener
PORTEC INC8 citations73
US4273486AJun 16, 1981
Winch and chain attachment assembly
PORTEC INC18 citations73
US4092040AMay 30, 1978
Adjustable twist lock
PORTEC INC14 citations73
US4354235AOct 12, 1982
Guidance system detector circuit
PORTEC INC13 citations72
US4059055ANov 22, 1977
Railway car hinge-deck lock
PORTEC INC10 citations72
US5060788AOct 29, 1991
Chain guide mounting apparatus
PORTEC INC15 citations71
US4150792AApr 24, 1979
Rail fastener
PORTEC INC10 citations71
US4444123AApr 24, 1984
Curved roof hooper car
PORTEC INC15 citations68
US4454823AJun 19, 1984
Bulk freight rail car with metallized interior surfaces
PORTEC INC9 citations66
US7650979B2Jan 26, 2010
Ball transfer device
PORTEC INC7 citations64
USD278171SMar 26, 1985
Idler for a low profile tie down
PORTEC INC2 citations62
US4304359ADec 8, 1981
Rail fastener
PORTEC INC6 citations62
US4723807AFeb 9, 1988
Wheel and track system
PORTEC INC2 citations60
US4027216AMay 31, 1977
Control device for a synchronous motor
PORTEC INC18 citations60
US6050395AApr 18, 2000
Knife edge converter
PORTEC INC10 citations59
US4455947AJun 26, 1984
Covered hopper car
PORTEC INC12 citations59
US4265150AMay 5, 1981
Variable follower rest for a lathe
PORTEC INC10 citations59
US4196804AApr 8, 1980
Belt tightener for spiral conveyor belt
PORTEC INC14 citations59
US3942454AMar 9, 1976
Adjustable compression unit and lading band anchor
PORTEC INC7 citations58
US5143207ASep 1, 1992
Tension controlling and shock absorbing apparatus for an endless conveyor
PORTEC INC6 citations57
US4060197ANov 29, 1977
Rail fastener assembly
PORTEC INC4 citations54
US4256259AMar 17, 1981
Insulated rail joint
PORTEC INC1 citations48
US4273284AJun 16, 1981
Insulated rail joint
PORTEC INC4 citations45
US5482152AJan 9, 1996
Sortation table
PORTEC INC0 citations42