Granted Patent
Utility
US 4,920,189 · App. 07/089,934
Process for the production of toluene-soluble, sulphur-modified chloroprene polymers
Inventors:
Werner Obrecht, Peter Wendling, Wilhelm Gobel, Eberhard Muller
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Aug 25, 1987
Inventors
Werner Obrecht
Peter Wendling
Wilhelm Gobel
Eberhard Muller
Assignee (at issue)
Bayer Aktiengesellschaft
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.