Inventor

PFAFF GERHARD

DE62 patents

⚠️ This page may combine multiple inventors who share the name “PFAFF GERHARD”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

MERCK PATENT GMBH

45 patents

US6596070B1Jul 22, 2003

Interference pigments

MERCK PATENT GMBH211 citations98

US6517628B1Feb 11, 2003

Pigment mixture

MERCK PATENT GMBH129 citations98

US5858078AJan 12, 1999

Platelet-shaped titanium dioxide pigment

MERCK PATENT GMBH171 citations98

US5286291AFeb 15, 1994

Pigments containing carbon black

MERCK PATENT GMBH65 citations96

US6294010B1Sep 25, 2001

Pigment mixture

MERCK PATENT GMBH51 citations95

US6280520B1Aug 28, 2001

Multilayer pearl luster pigment based on an opaque substrate

MERCK PATENT GMBH57 citations95

US6267810B1Jul 31, 2001

Pigment mixture

MERCK PATENT GMBH94 citations95

US6156115ADec 5, 2000

Multilayer interference pigment with transparent central layer

MERCK PATENT GMBH80 citations95

US5350448ASep 27, 1994

Electrically conductive pigments

MERCK PATENT GMBH56 citations95

US5320781AJun 14, 1994

Conductive pigment

MERCK PATENT GMBH62 citations94

US7416688B2Aug 26, 2008

Transparent conductive pigments

MERCK PATENT GMBH20 citations92

US6727308B2Apr 27, 2004

Laser-markable plastics

MERCK PATENT GMBH27 citations92

US6656259B2Dec 2, 2003

Multilayered interference pigments

MERCK PATENT GMBH38 citations92

US6648957B1Nov 18, 2003

Multilayer nacreous pigment

MERCK PATENT GMBH47 citations92

US6500251B1Dec 31, 2002

Multi-coated interference pigments

MERCK PATENT GMBH45 citations92

US6376577B2Apr 23, 2002

Laser-markable plastics

MERCK PATENT GMBH25 citations92

US6334893B1Jan 1, 2002

Pigment mixture

MERCK PATENT GMBH41 citations92

US6291065B1Sep 18, 2001

Pigment flakes

MERCK PATENT GMBH22 citations92

US6291551B1Sep 18, 2001

Laser-markable plastics

MERCK PATENT GMBH49 citations92

US6284032B2Sep 4, 2001

Multilayer interference pigments

MERCK PATENT GMBH31 citations92

US6238472B1May 29, 2001

Metal oxide coated titanium dioxide lamellas

MERCK PATENT GMBH33 citations92

US6132504AOct 17, 2000

Multilayer interference pigment with absorbent central layer

MERCK PATENT GMBH37 citations92

US5945035AAug 31, 1999

Conductive pigments

MERCK PATENT GMBH40 citations92

US5985020ANov 16, 1999

Plate-like titanium dioxide reduction pigment

MERCK PATENT GMBH20 citations91

US5972098AOct 26, 1999

Titanate-containing pearlescent pigments

MERCK PATENT GMBH40 citations91

US7060126B2Jun 13, 2006

Multilayered luster pigments

MERCK PATENT GMBH23 citations89

US6767633B2Jul 27, 2004

Transparent medium having angle-selective transmission or reflection properties and/or absorption properties

MERCK PATENT GMBH32 citations89

US6337160B1Jan 8, 2002

Manganese dioxide electrodes, process for producing the same and their use

MERCK PATENT GMBH24 citations89

US10647861B2May 12, 2020

α-alumina flakes

MERCK PATENT GMBH11 citations85

US6419736B1Jul 16, 2002

Sulfide and oxysulphide pigments

MERCK PATENT GMBH17 citations84

US7691196B2Apr 6, 2010

Effect pigments

MERCK PATENT GMBH14 citations83

US6997982B2Feb 14, 2006

Pigment with a metallic luster

MERCK PATENT GMBH13 citations83

US6929690B2Aug 16, 2005

Pigment with a metallic luster

MERCK PATENT GMBH13 citations83

US7255736B2Aug 14, 2007

Effect pigments based on thin SiO2 flakes

MERCK PATENT GMBH10 citations82

US7202288B2Apr 10, 2007

Laser-markable pigments containing an absorber coated with a marker

MERCK PATENT GMBH15 citations82

US6348259B1Feb 19, 2002

Modified electrode material and its use

MERCK PATENT GMBH14 citations80

US6552102B2Apr 22, 2003

Pigment flakes

MERCK PATENT GMBH12 citations74

US5536447AJul 16, 1996

Substrate-free conductive pigments

MERCK PATENT GMBH6 citations74

US7708823B2May 4, 2010

Semi-transparent interference pigments containing tin

MERCK PATENT GMBH6 citations73

US5827361AOct 27, 1998

Carbon-containing figments

MERCK PATENT GMBH14 citations73

US11180659B2Nov 23, 2021

Alpha-alumina flakes

MERCK PATENT GMBH1 citations72

US5753024AMay 19, 1998

Grey pigments containing tin

MERCK PATENT GMBH13 citations72

US7169223B1Jan 30, 2007

Effect pigments having a strong color flop

MERCK PATENT GMBH9 citations71

US6602340B1Aug 5, 2003

Transparent medium with angular-selective transmitting or reflecting properties

MERCK PATENT GMBH9 citations71

US5611852AMar 18, 1997

Stabilized conductive pigment

MERCK PATENT GMBH12 citations70

SIEMENS AG

2 patents

US6456897B1Sep 24, 2002

Control method and numerical control for motion control of industrial machine tools

SIEMENS AG33 citations90

US4480301AOct 30, 1984

Method and apparatus for controlling a pulsed frequency converter

SIEMENS AG21 citations80

MERCK PATENT GES MIT CESCHRANK

1 patent

US5702518ADec 30, 1997

Gold pigments

MERCK PATENT GES MIT CESCHRANK22 citations90

WERNER & PFLEIDERER

1 patent

US4984977AJan 15, 1991

Screw-type extruder having a starting valve and throttle

WERNER & PFLEIDERER53 citations89

MERCK PATENT GES BESCHRAENKTER

1 patent

US6372036B1Apr 16, 2002

Pigment preparation and its use especially in printing inks

MERCK PATENT GES BESCHRAENKTER8 citations73

Showing the top 50 of 62 patents by PatentIndex Score.