Granted Patent
Utility
US 4,894,481 · App. 07/215,283
Method of making cyclic aryl chlorophosphites
Inventor:
Edward A. Burt
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Jul 5, 1988
Inventor
Edward A. Burt
Assignee (at issue)
Ethyl Corporation
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.