Granted Patent
Utility
US 4,904,357 · App. 07/358,884
Production of quaternary ammonium and quaternary phosphonium borohydrides
Inventors:
Hossein Sharifian, John S. Dutcher
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: May 30, 1989
Inventors
Hossein Sharifian
John S. Dutcher
Assignee (at issue)
Southwestern Analytical
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.