Gerhard Pfaff — 62 Patents at Merck

Gerhard Pfaff has been granted 62 US patents while listed as an inventor at Merck. The first was granted in 1984 and the most recent in February 2024. Gerhard Pfaff ranks #36,550 of 4,157,543 US inventors in our database (top 0.88%). Patent records list Gerhard Pfaff in Munster, DE.

Patents per Year

Issued Patents All Time

Showing 51–62 of 62 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5827361	Carbon-containing figments	Klaus Bernhardt, Reiner Vogt	1998-10-27	$312,218,000
5753024	Grey pigments containing tin	Reiner Vogt, Klaus Bernhard, Matthias Kuntz, Susanne Rudolph, Sylvia Schmidt	1998-05-19	$131,585,000
5702518	Gold pigments	Reiner Vogt, Klaus Bernhard	1997-12-30	$100,706,000
5611852	Stabilized conductive pigment	Hans-Dieter Bruckner	1997-03-18	$78,728,000
5536447	Substrate-free conductive pigments	Gerd Bauer	1996-07-16	$47,913,000
5350448	Electrically conductive pigments	Johann Dietz, Klaus-Dieter Franz, Reiner Vogt, Katsuhisa Nitta	1994-09-27	$22,745,000
5320781	Conductive pigment	Otto Stahlecker, Manfred Thon, Ralf Glausch, Manfred Kieser, Wilhelm Gobel	1994-06-14	$46,737,000
5286291	Pigments containing carbon black	Klaus Bernhardt	1994-02-15	$47,511,000
4984977	Screw-type extruder having a starting valve and throttle	Albert Grimminger, Wolfgang Lauser, Franz-Josef Müller, Edgar Schlipf	1991-01-15
4754539	Method and extractor device for separating worm elements of an extruder from a worm shaft	Arno Knoll, Wolfgang Worz	1988-07-05
4488215	Method and apparatus for controlling the load current of a pulsed frequency converter	Albert Wick	1984-12-11
4480301	Method and apparatus for controlling a pulsed frequency converter	Albert Wick	1984-10-30

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