Granted Patent
Utility
US 4,287,038 · App. 06/147,981
Purification of chlorophenolic derived compounds
Inventors:
Edward M. Geiser, Russell W. Johnson
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: May 8, 1980
Inventors
Edward M. Geiser
Russell W. Johnson
Assignee (at issue)
UOP LLC
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.