Granted Patent
Utility
US 4,656,222 · App. 06/734,521
Preparation of high molecular weight polyacrylates by inverse emulsion polymerization
Inventor:
Charles A. DeFazio
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: May 16, 1985
Inventor
Charles A. DeFazio
Assignee (at issue)
Celanese GmbH
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.