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Inventor

Masaaki Ohkawa

Inventor
Takatsuki, JP

Overview

4→
Patents
1976–1977
Patent span
Chemistry
Primary field (CPC C)

Patents· 4 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. pigments43%
C02FTreatment of water, waste water, sewage, or sludge14%
C07DHeterocyclic compounds14%
D06PDyeing or printing textiles14%
G04GElectronic time-pieces14%
PatentTitleYear
4,018,756'Thiazole and benzothiazole cationic dyes'19773,974,178'Naphthostyril cationic dyes'19763,966,594'Treatment of aqueous waste solution'19763,933,847'Method relating to manufacture of coumarin derivatives'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1977Patents assigned to SUMITOMO CHEMICAL CO (4)· patent assignee history
1976–1977Based in Takatsuki, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
SUMITOMO CHEMICAL CO41976–1977
Locations
LocationPatentsSpan
Takatsuki, JP41976–1977