Granted Patent
Utility
US 5,202,496 · App. 07/842,950
Method of making isophorne
Inventors:
Alain Schutz, Leonard A. Cullo
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Feb 28, 1992
Inventors
Alain Schutz
Leonard A. Cullo
Assignee (at issue)
Aristech 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.