Granted Patent
Utility
US 6,380,291 · App. 09/407,512
Rubber compositions and method of making them
Inventor:
Carl von Hellens
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Sep 28, 1999
Inventor
Carl von Hellens
Assignee (at issue)
Bayer 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.