Granted Patent
Utility
US 4,444,938 · App. 06/385,958
Phenyltetralylbutane as vinyl plasticizer
Inventors:
Eugene L. Coggins, William D. Vanderwerff
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Jun 7, 1982
Inventors
Eugene L. Coggins
William D. Vanderwerff
Assignee (at issue)
SUN-TECH LIMITED
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.