Granted Patent
Utility
US 4,980,106 · App. 07/409,882
Method for dry-pelletizing carbon black and equipment to implement the method
Inventor:
Karl Vogel
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Sep 20, 1989
Inventor
Karl Vogel
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.