Granted Patent
Utility
US 5,017,633 · App. 07/376,334
Filled polyolefins stabilized with a combination of a hindered phenol and a phenylphosphonite
Inventor:
Guenther Tscheulin
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Jul 6, 1989
Inventor
Guenther Tscheulin
Assignee (at issue)
Sandoz 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.