Inventor

Hans-Heinrich Credner

Inventor

Hohenschaeftlarn, DE

Overview

1976–1997

Patent span

Physics

Primary field (CPC G)

Patents· 15 as inventor

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

G03Cprimary

G03CPhotosensitive materials for photographic purposes33%

C07DHeterocyclic compounds17%

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

G11BInformation storage based on relative movement between record carrier and transducer13%

C07CAcyclic or carbocyclic compounds7%

Y10TTechnical subjects covered by former us classification7%

B41FPrinting machines or presses3%

C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments3%

PatentTitleYear

5,660,760'Magnetic coating dispersion'1997 5,415,929'Magnetic recording medium having a magnetic layer prepared from magnetic particles using specified dispersants which enhance the electrostatic change on the magnetic pigment surface'1995 5,256,497'Magnetic tape containing abrasives'1993 4,981,719'Process for the production of a magnetic recording material'1991 4,444,867'Photographic recording material for diffusion processes and new non-diffusing sulfilimine compounds suitable for use therein'1984 4,369,243'Photographic recording material for diffusion processes and useful non-diffusing sulfilimine compounds'1983 4,275,200'Process for the production of oxazolinone-2-compounds'1981 4,198,239'Color photographic materials containing an antistain agent'1980 4,175,968'Color photographic materials containing anti-fogging agents'1979 4,123,281'Photographic silver halide color material containing fast-acting hardener and 2-pyrazolin-5-one coupler precursors'1978 4,062,683'Photographic material containing 3-anilino-5-pyrazolylalkylcarbonate or arylcarbonate couplers'1977 4,061,498'Photographic material containing 2-acyl-2-pyrazolin-5-on-couplers'1977 4,059,447'Photographic material containing oxazolinone-2 couplers'1977 4,052,213'Light-sensitive photographic material'1977 3,941,601'Photographic silver halide material which contains color couplers'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1991Patents assigned to AGFA GEVAERT AG (9)· patent assignee history

1976–1997Based in Hohenschaeftlarn, DE· patent location history

1977–1978Patents assigned to AGFA GEVAERT NV (3)· patent assignee history

1977–1978Based in Munich, DE· patent location history

1993–1997Patents assigned to BASF MAGNETICS GMBH (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
AGFA GEVAERT AG	9	1976–1991
AGFA GEVAERT NV	3	1977–1978
BASF MAGNETICS GMBH	3	1993–1997

Locations

Location	Patents	Span
Hohenschaeftlarn, DE	12	1976–1997
Munich, DE	3	1977–1978