Granted Patent
Utility
US 4,997,953 · App. 07/425,111
Process for preparing N,N'-bis(tetrabromophthalimide)
Inventor:
Michael G. McKenna
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Oct 23, 1989
Inventor
Michael G. McKenna
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.