Granted Patent
Utility
US 5,188,806 · App. 07/721,765
Method and apparatus for producing carbon black
Inventors:
Gerhard Kuehner, Karl Vogel, Juan Rodriguez, Charles D. Clement
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Jun 28, 1991
Inventors
Gerhard Kuehner
Karl Vogel
Juan Rodriguez
Charles D. Clement
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.