Granted Patent
Utility
US 4,923,939 · App. 07/312,151
Ring opening polymerization with organophosphonium and organoarsonium metathesis catalysts
Inventor:
Brian L. Goodall
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Feb 21, 1989
Inventor
Brian L. Goodall
Assignee (at issue)
B. F. Goodrich 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.