Granted Patent
Utility
US 5,126,474 · App. 07/585,746
Polyadducts of alkylene oxide and styrene oxide with aryl alkanols
Inventor:
Rosemarie Topfl
Patented Case
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Granted: Jun 30, 1992
Filed: Sep 20, 1990
Inventor
Rosemarie Topfl
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.