Granted Patent
Utility
US 5,369,023 · App. 08/104,493
Method of purifying putrescine n-methyltransferase from tobacco plant extract with an anion exchange medium
Inventors:
Herbert Y. Nakatani, Vedpal S. Malik
Patented Case
View Patent ↗
Granted: Nov 29, 1994
Filed: Aug 9, 1993
Inventors
Herbert Y. Nakatani
Vedpal S. Malik
Assignee (at issue)
Philip Morris Inc.
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.