Granted Patent
Utility
US 4,306,944 · App. 06/165,905
Cyclohexanone distillation process
Inventors:
Andiappan K. S. Murthy, David Hsieh
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Jul 3, 1980
Inventors
Andiappan K. S. Murthy
David Hsieh
Assignee (at issue)
ALLIED CONSULTING, 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.