Granted Patent
Utility
US 4,456,697 · App. 06/422,324
Catalysts for alkoxylation reactions
Inventor:
Kang Yang
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Sep 23, 1982
Inventor
Kang Yang
Assignee (at issue)
Conoco 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.