Granted Patent
Utility
US 4,585,525 · App. 06/536,971
Purifying trimethylphenol by azeotropic distillation
Inventor:
Richard C. Grimm
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Sep 29, 1983
Inventor
Richard C. Grimm
Assignee (at issue)
Union Carbide 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.