Granted Patent
Utility
US 6,191,317 · App. 09/386,870
Process for preparation of polyalkyl hydroxyaromatics
Inventor:
Wei-Yang Su
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Aug 31, 1999
Inventor
Wei-Yang Su
Assignee (at issue)
HUNTSMAN PETROCHEMICAL LLC
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.