Granted Patent
Utility
US 4,390,663 · App. 06/351,840
Semi-continuous process for making star-block copolymers
Inventor:
Harold L. Nicholson
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Feb 24, 1982
Inventor
Harold L. Nicholson
Assignee (at issue)
Atlantic Richfield Company
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.