Inventor

FREY JOHANN-WILHELM

DE7 patents

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

DOW GLOBAL TECHNOLOGIES INC

3 patents

US6740684B2May 25, 2004

Process for producing a strong-acid cation exchange resin

DOW GLOBAL TECHNOLOGIES INC5 citations52

US7067704B2Jun 27, 2006

Process for purifying bisphenol-a

DOW GLOBAL TECHNOLOGIES INC1 citations47

US7586012B2Sep 8, 2009

Process for recovering an adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound

DOW GLOBAL TECHNOLOGIES INC1 citations43

DOW CHEMICAL CO

2 patents

US5288926AFeb 22, 1994

Process for preparing a bisphenol

DOW CHEMICAL CO35 citations88

US5723688AMar 3, 1998

Process for preparing an adduct of a bisphenol with phenolic compound

DOW CHEMICAL CO15 citations66

HEFNER JR ROBERT E

1 patent

US8937145B2Jan 20, 2015

Epoxy resin compositions

HEFNER JR ROBERT E0 citations49

DOW GLOBAL TECHNOLOGIES LLC

1 patent

US7989514B2Aug 2, 2011

Strong-acid cation exchange resins

DOW GLOBAL TECHNOLOGIES LLC0 citations48