Granted Patent
Utility
US 4,409,152 · App. 06/307,034
Continuous high pressure process for preparing phenylphosphonous dichloride
Inventor:
Lawrence Humphrey
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Sep 30, 1981
Inventor
Lawrence Humphrey
Assignee (at issue)
Stauffer Chemical 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.