P

Inventor

EVANS GRAHAM

CA11 patents
⚠️ This page may combine multiple inventors who share the name “EVANS GRAHAM”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

CIBA GEIGY AG

6 patents
US4336326AJun 22, 1982

Optical brightening agents and photographic materials which contain these brightening agents

CIBA GEIGY AG5 citations72
US4510238AApr 9, 1985

Photographic material and a process for its manufacture

CIBA GEIGY AG8 citations71
US4115121ASep 19, 1978

Silver halide color photographic material containing yellow coupler

CIBA GEIGY AG5 citations62
US4182886AJan 8, 1980

Amino-substituted hydroxy-pyridones

CIBA GEIGY AG3 citations60
US4229577AOct 21, 1980

Yellow photographic color couplers containing 3-imino-1,3,4-thiadiazolyl-4 groups

CIBA GEIGY AG0 citations51
US4302579ANov 24, 1981

Optical brightening agents and photographic materials which contain these brightening agents

CIBA GEIGY AG1 citations50

DARWIN DISCOVERY LTD

2 patents
US6323368B1Nov 27, 2001

Process

DARWIN DISCOVERY LTD17 citations82
US5859279AJan 12, 1999

Compound and process

DARWIN DISCOVERY LTD10 citations73

CIBA GEIGY

1 patent
US4233399ANov 11, 1980

Photographic elements containing amino-substituted hydroxy-pyridones

CIBA GEIGY9 citations71

EVANS GRAHAM

1 patent
US10552809B2Feb 4, 2020

Programmable card

EVANS GRAHAM5 citations69

PILKINGTON PERKIN ELMER LTD

1 patent
US5731918AMar 24, 1998

Lens mounting for optical instrument

PILKINGTON PERKIN ELMER LTD5 citations55