Granted Patent
Utility
US 5,239,093 · App. 07/930,114
Process for the preparation of addition products of epoxides and alcohols
Inventor:
Chi-Wen Cheng
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Aug 14, 1992
Inventor
Chi-Wen Cheng
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.