Granted Patent
Utility
US 5,583,253 · App. 07/676,143
Method of preparing purified alkanesulfonic acid
Inventors:
Phyllis A. Henderson, Steven G. Schon, Carl Postuma
Patented Case
View Patent ↗
Granted: Dec 10, 1996
Filed: Mar 27, 1991
Inventors
Phyllis A. Henderson
Steven G. Schon
Carl Postuma
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.