Granted Patent
Utility
US 5,543,458 · App. 08/381,242
Process for making graft block copolymers by growing anionic polymer chains from functionalized polyolefin backbones
Inventors:
Ronald J. Hoxmeier, Robert C. Job, Bridget A. Spence, Donn A. DuBois
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Jan 31, 1995
Inventors
Ronald J. Hoxmeier
Robert C. Job
Bridget A. Spence
Donn A. DuBois
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.