Granted Patent
Utility
US 4,994,613 · App. 07/470,410
Process for preparing 4-hydroxyacetophenone oxime with mother liquor recycle
Inventor:
Olan S. Fruchey
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Jan 29, 1990
Inventor
Olan S. Fruchey
Assignee (at issue)
Hoechst Celanese Corporation
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.