Inventor
HOELSCHER CHARLES H
US6 patents
Patents
6 patentsUS4931220AJun 5, 1990
Organic photochromic pigment particulates
PPG INDUSTRIES INC377 citations96
US4634767AJan 6, 1987
Method for preparing spiro(indoline)-type photochromic compounds
PPG INDUSTRIES INC40 citations91
US4094808AJun 13, 1978
Solubility stable encapsulated diperisophthalic acid compositions
PPG INDUSTRIES INC41 citations84
US5288877AFeb 22, 1994
Continuous process for preparing indolenine compounds
PPG INDUSTRIES INC3 citations58
US4605545AAug 12, 1986
Method for producing sodium dithionite
PPG INDUSTRIES INC0 citations51
US5019659AMay 28, 1991
Method of separating 2-nitrosophenol isomer from admixture with 4-nitrosophenol isomer
PPG INDUSTRIES INC1 citations50