Inventor

Hisato Itoh

Inventor

Yokohama, JP

Overview

49→

Patents

1989–2001

Patent span

Chemistry

Primary field (CPC C)

Patents· 49 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C09Bprimary

C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments28%

G11BInformation storage based on relative movement between record carrier and transducer13%

G02BOptical elements, systems or apparatus11%

C07DHeterocyclic compounds8%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests8%

Y10TTechnical subjects covered by former us classification5%

C09KMaterials for miscellaneous applications, not provided for elsewhere5%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices5%

G03GElectrography4%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein3%

PatentTitleYear

6,306,550'Color filters'2001 6,242,651'Process for the preparation of N,N\'-dialkylalkanediamines'2001 6,203,725'Luminescent compound for controlling traveling and method for controlling traveling using the same'2001 6,051,360'Dyestuffs and resin compositions'2000 5,952,477'Azo compound and polarizing film'1999 5,948,597'Dyes for color filters and photosensitive resist resin composition containing the same'1999 5,789,137'Dyes for color filters and photosensitive resist resin composition containing the same'1998 5,773,172'Color filter having novel dyestuff'1998 5,750,229'Phthalocyanine compound and optical recording medium containing it'1998 5,750,599'Quinophthalone compounds and polarizing films using same'1998 5,751,483'Color filter having polarizability'1998 5,739,298'Water-soluble azo compounds'1998 5,698,682'Azo compounds and polarizing films using the compounds'1997 5,695,911'Optical recording medium'1997 5,659,039'Quinophthalone compounds'1997 5,646,273'Phthalocyanine compound and optical recording medium containing it'1997 5,639,809'Azo compounds and polarizing films using the compounds'1997 5,618,868'Polarizing film of a hydrophilic polymer film containing a novel azo compound'1997 5,582,774'Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same'1996 5,578,419'Dyes for color filters, and photosensitive resist resin composition containing the same'1996 5,548,073'Water-soluble azo compounds'1996 5,482,804'Resin composition for color filter'1996 5,482,986'Benzopyran compound and use of the same'1996 5,449,587'Compact disk-write once type optical recording media'1995 5,446,142'Phthalocyanine and naphthalocyanine light-absorbing compound and optical recording medium containing same'1995 5,446,141'Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same'1995 5,446,135'Sulfonyloxy substituted tris-azoaryl dyes and copper complex salts thereof and polarizing films dyed therewith'1995 5,423,100'Water-soluble azo compounds and polarizing films using the compounds'1995 5,409,634'Near infrared absorbers and display/recording materials using the same'1995 5,387,678'Halogenation process of phthalocyanine and halogenated alkoxyphthalocyanine'1995 5,382,465'Anthraquinonic colorant and polarizing film containing the colorant'1995 5,380,842'Phthalocyanine compounds and usage thereof'1995 5,358,833'Amorphous phthalocyanine compound or mixture of amorphous phthalocyanine compounds, and method for preparing same'1994 5,350,843'Halogenated phthalocyanine compound, method for preparing same'1994 5,334,714'Method for preparing alkoxyphthalocyanine'1994 5,318,856'Water-soluble azo dyes and polarizing films using the dyes'1994 5,280,114'Halogenation of alkoxyphthalocyanine'1994 5,270,463'Halogenated alkoxyphthalocyanines'1993 5,252,769'Anthraquinonic colorant and polarizing film containing the colorant'1993 5,235,104'Hydrazones and electrophotographic photoreceptors comprising them'1993 5,220,010'Method for preparation alkoxyphthalocyanine'1993 5,132,190'Hydrozones and electrophotographic photoreceptors comprising them'1992 5,024,926'Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same'1991 5,023,343'P-amino substituted tetraphenylthiophenes and electrophotographic photoreceptors containing them'1991 4,970,021'Phthalocyanine compounds and utility thereof'1990 4,963,449'P-amino substituted tetraphenylthiophenes and electrophotographic photoreceptors containing them'1990 4,960,538'1,2-naphthalocyanine near-infrared absorbent and recording/display materials using same'1990 4,808,507'Electrophotographic photoreceptor 2-Phenyl-benzooxazole bisazo based'1989 4,808,503'Electrophotographic receptors with charge generating azo-substituted tetraphenyl-thiophene or thiophene 1,1-dioxide'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1998Patents assigned to MITSUI TOATSU CHEMICALS (42)· patent assignee history

1989–2001Based in Yokohama, JP· patent location history

1990–1998Patents assigned to YAMAMOTO CHEMICALS INC (19)· patent assignee history

1996–2001Based in Fukuoka, JP· patent location history

1996–1999Based in Kanagawa, JP· patent location history

1997–1998Based in Ohmuta, JP· patent location history

1998–2001Patents assigned to MITSUI CHEMICALS INC (7)· patent assignee history

1998–2000Based in Omuta, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MITSUI TOATSU CHEMICALS	42	1989–1998
YAMAMOTO CHEMICALS INC	19	1990–1998
MITSUI CHEMICALS INC	7	1998–2001

Locations

Location	Patents	Span
Yokohama, JP	35	1989–2001
Fukuoka, JP	5	1996–2001
Kanagawa, JP	4	1996–1999
Omuta, JP	2	1998–2000
Ohmuta, JP	2	1997–1998