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Inventor

John T. Ouderkirk

Inventor
Westerly, RI, US

Overview

2→
Patents
1983–1990
Patent span
Chemistry
Primary field (CPC C)

Patents· 2 as inventor

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

C01Cprimary
C01CAmmonia20%
C01PIndexing scheme relating to structural and physical aspects of solid inorganic compounds20%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments20%
C09DCoating compositions, e.g. paints, varnishes or lacquers20%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests20%
PatentTitleYear
4,968,352'Diaryl pigments with improved heat stability and transparency containing coupled mixed bis-diazotized diamines and acid-substituted aromatic amines'19904,414,033'Process for preparing ferriferrocyanide pigments'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983Patents assigned to BASF WYANDOTTE CORP (1)· patent assignee history
1983Based in Holland, MI, US· patent location history
1990Patents assigned to HOECHST CELANESE CORP (1)· patent assignee history
1990Based in Westerly, RI, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
BASF WYANDOTTE CORP11983
HOECHST CELANESE CORP11990
Locations
LocationPatentsSpan
Westerly, RI, US11990
Holland, MI, US11983