Inventor

RITCHIE DAVID JOHN

GB7 patents

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

ZENECA LTD

5 patents

US6048998AApr 11, 2000

One-step process for preparing methyl 2-(halomethyl)phenylacetate from 3-isochromanone

ZENECA LTD6 citations69

US6018045AJan 25, 2000

Process for preparing 4,6-dichloro-pyrimidine

ZENECA LTD5 citations60

US6015905AJan 18, 2000

Process for the preparation of 2-(6-substituted pyrid-2-yloxymethyl) phenylacetate

ZENECA LTD3 citations58

US6096892AAug 1, 2000

Chemical process

ZENECA LTD5 citations57

US6207840B1Mar 27, 2001

Process for preparing 3-isochromanone

ZENECA LTD0 citations43

SYNGENTA LTD

1 patent

US6888008B2May 3, 2005

Process for preparing 3-isochromanone

SYNGENTA LTD0 citations41

SYNGENTA CROP PROT INC

1 patent

US7491834B2Feb 17, 2009

Chemical process

SYNGENTA CROP PROT INC0 citations33