Granted Patent
Utility
US 5,589,030 · App. 08/350,835
Method for preparing vanillin from old newsprint
Inventors:
Walter E. Sande, Karl D. Sears
Patented Case
View Patent ↗
Granted: Dec 31, 1996
Filed: Dec 7, 1994
Inventors
Walter E. Sande
Karl D. Sears
Assignee (at issue)
Rhone-Poulenc, 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.