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Inventor

Aloysius Engel

Inventor
Leverkusen, DE

Overview

4→
Patents
1990–2014
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. pigments40%
C07DHeterocyclic compounds20%
C09DCoating compositions, e.g. paints, varnishes or lacquers10%
C12QMeasuring or testing processes involving enzymes, nucleic acids or microorganisms10%
D21HPulp compositions10%
Y10TTechnical subjects covered by former us classification10%
PatentTitleYear
8,834,581'Disazo dyes, preparation and use'20145,502,174'Reactive dyestuffs based on a substituted barbituric acid'19964,962,040'2-hydrazono-4,6-dinitrobenzthiazolones useful to form dyestuffs and as color formers for detecting peroxide'19904,920,208'Basic azo dyestuffs'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990–1996Patents assigned to BAYER AG (3)· patent assignee history
1990–1996Based in Leverkusen, DE· patent location history
2014Patents assigned to DYSTAR COLOURS DISTRIB GMBH (1)· patent assignee history
2014Patents assigned to ENGEL ALOYSIUS (1)· patent assignee history
2014Patents assigned to GRUND CLEMENS (1)· patent assignee history
2014Patents assigned to GÖRLITZ GUNTER (1)· patent assignee history
2014Based in Köln, DE· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
BAYER AG31990–1996
DYSTAR COLOURS DISTRIB GMBH12014
ENGEL ALOYSIUSself12014
GRUND CLEMENS12014
GÖRLITZ GUNTER12014
Locations
LocationPatentsSpan
Leverkusen, DE31990–1996
Köln, DE12014