Granted Patent
Utility
US 5,434,294 · App. 08/223,399
Method of making plasticizers
Inventors:
Joseph Pugach, Thomas W. Smeal
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Apr 4, 1994
Inventors
Joseph Pugach
Thomas W. Smeal
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.