Inventor

ZHANG WEN-CHUN

US8 patents

⚠️ This page may combine multiple inventors who share the name “ZHANG WEN-CHUN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

NORAMCO INC

3 patents

US7906647B2Mar 15, 2011

Process for preparing oxycodone having reduced levels of 14-hydroxycodeinone

NORAMCO INC23 citations89

US10406153B2Sep 10, 2019

Process for the preparation of benzhydrocodone hydrochloride

NORAMCO INC0 citations45

US10287296B2May 14, 2019

Process for the preparation of (S)-2-((4R,4aS,6R,7R,7aR,12bS)-7,9-dimethoxy-1,2,3,4,5,6,7,7a-octahydro-4a,7-ethano-4,12-methanobenzofuro[3,2-e]isoquinolin-6-yl)-3,3-dimethylbutan-2-ol

NORAMCO INC0 citations38

PURISYS LLC

2 patents

US12338223B2Jun 24, 2025

Methods of preparing synthetic cannabinol and homologs thereof

PURISYS LLC1 citations47

US12269810B2Apr 8, 2025

Methods of preparing synthetic cannabichromene and cannabicitran and derivatives thereof

PURISYS LLC0 citations38

COX D PHILLIP

1 patent

US8058439B2Nov 15, 2011

Process for preparing oxycodone having reduced levels of 14-hydroxycodeinone

COX D PHILLIP13 citations79

PHARMACORE INC

1 patent

US6809207B2Oct 26, 2004

Amino acid derivatives

PHARMACORE INC0 citations39

NORAMCO LLC

1 patent

US11136318B2Oct 5, 2021

Processes for the preparation of aryl hydrocarbon receptor ligands

NORAMCO LLC0 citations36