Inventor

Denis Robert Annesley Ridyard

Inventor

Manchester, GB

Overview

1976–2001

Patent span

Chemistry

Primary field (CPC C)

Patents· 16 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. pigments67%

D06PDyeing or printing textiles17%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests17%

PatentTitleYear

6,271,355'Amine pyrazole nickel phthalocyanine dyes for coloration'2001 5,175,261'Azopyridone dyes'1992 5,171,852'Triphenodioxazine reactive dyes having sulphonate ester groups'1992 5,019,134'Reactive dyes'1991 4,881,943'Disperse dyes: nitro-thiophene azo dyes for bright blue shades on polyester'1989 4,330,468'Water soluble monoazo dyes for nylon'1982 4,213,759'Coloration process: mixed dyes for differential-dyeing nylon mixtures'1980 4,145,340'Water-soluble reactive monoazo dye containing a nonylphenoxy, chlorotriazine group'1979 4,083,858'Anthraquinone dyes'1978 4,075,200'4(2\'-Nitro-4\'-sulfoanilino) phenyl azo hydroxyphenyl dyes'1978 4,067,865'Water-soluble diazotized amino azo dyestuff coupled with an amino-phenyl or -naphthyl component'1978 4,060,383'Monoazo dyestuffs'1977 4,039,528'Sulphonic acid-, hydroxy-substituted phenyl azo-naphthyl azo-N-aryl amino dyes'1977 3,996,221'Dyestuffs'1976 3,993,440'Coloration with azo carboxy pyrazolone'1976 3,935,248'Anthraquinone dyes'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1982Patents assigned to ICI LTD (11)· patent assignee history

1976–1982Based in Manchester, GB· patent location history

1989–2001Patents assigned to ICI PLC (5)· patent assignee history

1989Based in Hazel Grove, GB· patent location history

1991–2001Based in Stockport, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ICI LTD	11	1976–1982
ICI PLC	5	1989–2001

Locations

Location	Patents	Span
Manchester, GB	11	1976–1982
Stockport, GB	4	1991–2001
Hazel Grove, GB	1	1989