Granted Patent
Utility
US 5,041,374 · App. 06/868,015
Polyether antibiotic recovery and purification
Inventors:
Alexander H. T. Chu, Robert J. Urban
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: May 29, 1986
Inventors
Alexander H. T. Chu
Robert J. Urban
Assignee (at issue)
International Minerals & Chemical Corp.
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.