Granted Patent
Utility
US 5,536,481 · App. 08/354,733
Use of cyclic aminals of glyoxylic acid for trapping hydrogen sulphide
Inventors:
Frederic Mabire, Didier Wilhelm
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: Dec 14, 1994
Inventors
Frederic Mabire
Didier Wilhelm
Assignee (at issue)
Societe Francaise Hoechst
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.