Inventor
PARKER JOHN J
11 patents
⚠️ This page may combine multiple inventors who share the name “PARKER JOHN J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HANCOR INC
10 patentsUS4523613AJun 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
US4247136AJan 27, 1981
Internal coupling structure and joint for pipe or tubing
HANCOR INC95 citations93
US4286808ASep 1, 1981
Snap-in tee connector
HANCOR INC53 citations92
US4254885AMar 10, 1981
Subterranean plastic tank
HANCOR INC33 citations91
US4363732ADec 14, 1982
Inlet and outlet baffle structure for sewage treatment tanks
HANCOR INC38 citations88
US4357190ANov 2, 1982
Method and apparatus for manufacturing non-round plastic tubing
HANCOR INC22 citations82
US4445542AMay 1, 1984
Arch end cap
HANCOR INC8 citations73