Granted Patent
Utility
US 4,433,173 · App. 06/384,317
Acetophenone purification
Inventors:
Vijai P. Gupta, Frank W. Melpolder, Walter A. Mameniskis
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Jun 2, 1982
Inventors
Vijai P. Gupta
Frank W. Melpolder
Walter A. Mameniskis
Assignee (at issue)
Atlantic Richfield 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.