Granted Patent
Utility
US 4,623,713 · App. 06/754,554
Solvent fractionation of guayule rubber
Inventors:
Robert T. Beinor, William M. Cole
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Jul 15, 1985
Inventors
Robert T. Beinor
William M. Cole
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.