Granted Patent
Utility
US 4,948,849 · App. 07/204,387
Process for making copolymers of aromatic vinyl compounds ADD conjugated diolefins having substantial increase in aromatic vinyl compound differential content
Inventors:
Robert J. Blythe, Robert Bond, Gerardus E. La Heij
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Jun 9, 1988
Inventors
Robert J. Blythe
Robert Bond
Gerardus E. La Heij
Assignee (at issue)
Shell Internationale Research Maatschappij B.V.
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.