Granted Patent
Utility
US 4,499,028 · App. 06/415,119
Preparation of isethionic acid
Inventor:
Kermit D. Longley
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Sep 7, 1982
Inventor
Kermit D. Longley
Assignee (at issue)
Witco Chemical 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.