Granted Patent
Utility
US 4,440,889 · App. 06/391,200
Polyethylene terephthalate molding compositions
Inventors:
William L. Hergenrother, John M. Doshak
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Jun 23, 1982
Inventors
William L. Hergenrother
John M. Doshak
Assignee (at issue)
The Firestone Tire & Rubber 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.