Granted Patent
Utility
US 3,969,422 · App. 05/551,456
Process for the separation of cresol isomers
Inventors:
Richard W. Neuzil, Donald H. Rosback
Patented Case
View Patent ↗
Granted: Jul 13, 1976
Filed: Feb 19, 1975
Inventors
Richard W. Neuzil
Donald H. Rosback
Assignee (at issue)
Universal Oil Products 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.