Granted Patent
Utility
US 4,218,429 · App. 05/906,583
Production of alkali metal dithionites from sulfur dioxide, alkali metal formates, and slurried bisulfite compounds at high reactant concentrations
Inventors:
Logan C. Bostian, Charles E. Winslow, Jr.
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: May 16, 1978
Inventors
Logan C. Bostian
Charles E. Winslow, Jr.
Assignee (at issue)
Virginia Chemicals Inc.
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.