Granted Patent
Utility
US 4,291,139 · App. 05/776,048
Process for preparation of block copolymers
Inventors:
Adel Farhan Halasa, James E. Hall, Adolph Para
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Mar 9, 1977
Inventors
Adel Farhan Halasa
James E. Hall
Adolph Para
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.