Granted Patent
Utility
US 4,352,942 · App. 06/242,692
Purification process
Inventors:
Anatoli Onopchenko, Edward T. Sabourin, Charles M. Selwitz
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Mar 11, 1981
Inventors
Anatoli Onopchenko
Edward T. Sabourin
Charles M. Selwitz
Assignee (at issue)
Gulf Research & Development Company
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.