Granted Patent
Utility
US 4,435,378 · App. 06/376,051
Process for removing extractable substances from carbon black
Inventors:
Reinhold Reck, Gerhard Kuhner, Manfred Voll, Peter Kleinschmit
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: May 7, 1982
Inventors
Reinhold Reck
Gerhard Kuhner
Manfred Voll
Peter Kleinschmit
Assignee (at issue)
Degussa AG
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.