Granted Patent
Utility
US 5,135,986 · App. 07/742,175
Stabilized styrene copolymers containing elastomer particles
Inventors:
Rolf Mulhaupt, Bernard Gilg, Gerhard Rytz, Mario Slongo
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Aug 1, 1991
Inventors
Rolf Mulhaupt
Bernard Gilg
Gerhard Rytz
Mario Slongo
Assignee (at issue)
Ciba-Geigy
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.