Granted Patent
Utility
US 4,407,528 · App. 06/330,112
High pressure insulating flange
Inventor:
Donald R. Anthony
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Dec 14, 1981
Inventor
Donald R. Anthony
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.