Granted Patent
Utility
US 4,504,652 · App. 06/603,591
Polyester plasticizer
Inventors:
Charles R. Widder, Don S. Wozniak
Patented Case
View Patent ↗
Granted: Mar 12, 1985
Filed: Apr 25, 1984
Inventors
Charles R. Widder
Don S. Wozniak
Assignee (at issue)
Sherex Chemical Co., 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.