Granted Patent
Utility
US 5,206,368 · App. 07/829,397
Process for extracting pyridine- and quinolinedicarboxylic acids from aqueous media
Inventor:
Richard L. Yager
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Feb 7, 1992
Inventor
Richard L. Yager
Assignee (at issue)
American Cyanamid 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.