Granted Patent
Utility
US 6,268,421 · App. 08/647,889
Reinforcement additives
Inventors:
Uwe Dittrich, Huhn Guenter, Hans-Guenther Srebny, Katrin Marschner
Patented Case
View Patent ↗
Granted: Jul 31, 2001
Filed: Oct 2, 1996
Inventors
Uwe Dittrich
Huhn Guenter
Hans-Guenther Srebny
Katrin Marschner
Assignee (at issue)
Huels Aktiengesellschaft
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.