Granted Patent
Utility
US 4,973,471 · App. 07/373,163
Method for producing dust-free sodium dithionite
Inventors:
Joseph L. Bush, Charles E. Winslow, Jr.
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Jun 29, 1989
Inventors
Joseph L. Bush
Charles E. Winslow, Jr.
Assignee (at issue)
Hoechst Celanese 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.