Granted Patent
Utility
US 4,622,216 · App. 06/762,839
Treatment of sodium dithionite reaction mixture
Inventors:
Charles E. Winslow, Jr., Joseph L. Bush, Daniel D. Dickens
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Aug 6, 1985
Inventors
Charles E. Winslow, Jr.
Joseph L. Bush
Daniel D. Dickens
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.