Inventor

Hugh M. Williamson

Inventor

Hanwell, GB

Overview

1993–2001

Patent span

Physics

Primary field (CPC G)

Patents· 14 as inventor

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

G03Cprimary

G03CPhotosensitive materials for photographic purposes61%

C07CAcyclic or carbocyclic compounds17%

C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments9%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%

C07DHeterocyclic compounds4%

PatentTitleYear

6,265,600'Activated propenes as color couplers method for the production thereof'2001 5,876,912'Pyrazolo 1,5 a benzimidazole photographic color couplers'1999 5,776,669'Phenol substituted pyrazolo 1, 5-a benzimidazole couplers'1998 5,498,515'Photographic element containing a certain sulfonated acylacetanilide coupler in combination with low- or non-chloride emulsions'1996 5,470,696'Photographic color couplers and photographic materials containing them'1995 5,466,813'Imine dye and photographic elements containing same'1995 5,460,927'Activated propenes as color couplers and a method for production of photographic elements therewith'1995 5,451,493'Photographic element containing a certain sulfonated acylacetanilide coupler in combination with a development inhibitor releasing coupler'1995 5,443,945'Activated propenes as colour couplers'1995 5,437,962'Photographic elements containing particular color couplers in combination with particular stabilizers'1995 5,436,124'Photographic elements containing particular color couplers in combination with polymeric stabilizers'1995 5,434,040'Photographic elements containing particular color couplers in combination with metal complex stabilizers'1995 5,434,041'Photographic elements containing particular color couplers in combination with hydroquinone type stabilizers'1995 5,260,179'Photographic elements containing imine dyes'1993

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1993–2001Patents assigned to EASTMAN KODAK CO (14)· patent assignee history

1993–1995Based in London, GB· patent location history

1995–2001Based in Hanwell, GB· patent location history

1995Based in Harrow, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
EASTMAN KODAK CO	14	1993–2001

Locations

Location	Patents	Span
Hanwell, GB	8	1995–2001
London, GB	5	1993–1995
Harrow, GB	1	1995