Granted Patent
Utility
US 5,238,971 · App. 07/984,760
Polyoxyalkylene glycols containing imidazolidones
Inventors:
Wei-Yang Su, Michael Cuscurida
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Dec 3, 1992
Inventors
Wei-Yang Su
Michael Cuscurida
Assignee (at issue)
Texaco Chemical Inc.
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.