Granted Patent
Utility
US 4,892,977 · App. 07/205,754
Preparation of nonionic surfactants by oxyalkylation with a magnesium catalyst
Inventor:
Edward C. Y. Nieh
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Jun 13, 1988
Inventor
Edward C. Y. Nieh
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.