Granted Patent
Utility
US 4,835,306 · App. 06/827,996
Preparation of 3-amino-4-hydroxybenzoic acids
Inventor:
Zenon Lysenko
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Feb 10, 1986
Inventor
Zenon Lysenko
Assignee (at issue)
THE DOW CHEMICAL 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.