Granted Patent
Utility
US 4,430,852 · App. 06/394,088
Polyolefin products and methods of making
Inventor:
Charles S. Hatcher
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Jul 1, 1982
Inventor
Charles S. Hatcher
Assignee (at issue)
Phillips Petroleum 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.