Granted Patent
Utility
US 4,435,337 · App. 06/298,447
Process for extracting rubber and by-products from guayule and guayule-like shrubs
Inventors:
Edward L. Kay, Richard Gutierrez
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Sep 1, 1981
Inventors
Edward L. Kay
Richard Gutierrez
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.