Assignee
HANCOR INC
US46 patents
Top patents by PatentIndex Score
US6698975B1Mar 2, 2004
Coupling structure for a leaching chamber
HANCOR INC61 citations95
US4523613AJun 18, 1985
Multi-layered corrugated conduit with "black-eye" like apertures
HANCOR INC122 citations95
US4360042ANov 23, 1982
Arched conduit with improved corrugations
HANCOR INC72 citations95
US4245924AJan 20, 1981
Arch conduit
HANCOR INC87 citations95
US4359167ANov 16, 1982
Subterranean plastic tank
HANCOR INC60 citations94
US4709723ADec 1, 1987
Septic tank for alternative sewer systems
HANCOR INC67 citations93
US4247136AJan 27, 1981
Internal coupling structure and joint for pipe or tubing
HANCOR INC95 citations93
USD537912SMar 6, 2007
Leaching chamber
HANCOR INC25 citations92
USD477381SJul 15, 2003
Leaching chamber
HANCOR INC21 citations92
US4480855ANov 6, 1984
Coupling structure for plastic pipe or tubing
HANCOR INC41 citations92
US4402898ASep 6, 1983
Coextrusion die assembly
HANCOR INC36 citations92
US4286808ASep 1, 1981
Snap-in tee connector
HANCOR INC53 citations92
US6199592B1Mar 13, 2001
Pipe structure and method of manufacture
HANCOR INC65 citations91
US5556231ASep 17, 1996
Severable leaching chamber with end cap
HANCOR INC67 citations91
US4527319AJul 9, 1985
Method and apparatus for manufacturing foldable conduit
HANCOR INC41 citations91
US4254885AMar 10, 1981
Subterranean plastic tank
HANCOR INC33 citations91
US4022384AMay 10, 1977
Irrigation tubing
HANCOR INC93 citations91
US5415436AMay 16, 1995
High pressuure coupling for plastic pipe and conduit
HANCOR INC49 citations90
US5326138AJul 5, 1994
High pressure coupling for plastic pipe and conduit
HANCOR INC63 citations90
US6907997B2Jun 21, 2005
Water clarification system with coalescing plates
HANCOR INC39 citations89
US6578882B2Jun 17, 2003
Corrugated pipe structure
HANCOR INC24 citations89
US4082327AApr 4, 1978
Connecting joint for corrugated plastic tubing
HANCOR INC56 citations89
US7033496B2Apr 25, 2006
Water clarification system with weir
HANCOR INC38 citations88
US6660199B2Dec 9, 2003
Pipe structure and method of manufacture
HANCOR INC14 citations88
US4363732ADec 14, 1982
Inlet and outlet baffle structure for sewage treatment tanks
HANCOR INC38 citations88
US6941972B2Sep 13, 2005
Corrugated pipe
HANCOR INC26 citations87
US4397585AAug 9, 1983
Apparatus for inserting foldable conduit below ground
HANCOR INC35 citations87
US5669733ASep 23, 1997
Angled adapter for a leaching chamber system
HANCOR INC46 citations86
USD538882SMar 20, 2007
Leaching chamber end cap
HANCOR INC13 citations84
USD538388SMar 13, 2007
Leaching chamber end cap
HANCOR INC10 citations84
USD538387SMar 13, 2007
Set of leaching chamber end units
HANCOR INC12 citations84
USD474524SMay 13, 2003
Leaching chamber
HANCOR INC14 citations83
US7063108B2Jun 20, 2006
Corrugation structure for pipe
HANCOR INC13 citations82
US6840285B2Jan 11, 2005
Corrugation structure for pipe
HANCOR INC15 citations82
US4357190ANov 2, 1982
Method and apparatus for manufacturing non-round plastic tubing
HANCOR INC22 citations82
US4374079AFeb 15, 1983
Method and apparatus for manufacturing expanded and layered semiround plastic tubings
HANCOR INC22 citations81
US4509911AApr 9, 1985
Coupling structure and method and apparatus for its manufacture
HANCOR INC10 citations74
USD474525SMay 13, 2003
Leaching chamber
HANCOR INC7 citations73
US4445542AMay 1, 1984
Arch end cap
HANCOR INC8 citations73
US3951439AApr 20, 1976
Modular cellular conduit assembly
HANCOR INC15 citations70
US6565350B2May 20, 2003
Apparatus for forming a reinforcing structure on an end of a pipe
HANCOR INC9 citations69
US4296891AOct 27, 1981
Expandable core for rolls of tubing
HANCOR INC10 citations65
US4076040AFeb 28, 1978
Alternator valve
HANCOR INC12 citations64
US4020868AMay 3, 1977
Alternator valve
HANCOR INC5 citations59
US3943971AMar 16, 1976
Diverter valve
HANCOR INC6 citations59
US4179227ADec 18, 1979
Dynamic plow assembly and method of operating same
HANCOR INC5 citations51