Granted Patent
Utility
US 5,149,774 · App. 07/560,689
Method for recycling discolored polyolefins
Inventors:
Ambelal R. Patel, Stephen D. Pastor
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Jul 31, 1990
Inventors
Ambelal R. Patel
Stephen D. Pastor
Assignee (at issue)
Ciba-Geigy
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.