Granted Patent
Utility
US 4,539,136 · App. 06/571,322
Process for the preparation of branched polymers
Inventor:
Antonius A. Broekhuis
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Jan 16, 1984
Inventor
Antonius A. Broekhuis
Assignee (at issue)
SHELL OIL 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.