Granted Patent
Utility
US 4,447,612 · App. 06/351,402
Catalysts for the production of 3-cyanopyridine
Inventors:
Helmut Beschke, Heinz Friedrich, Johannes Heilos
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Feb 23, 1982
Inventors
Helmut Beschke
Heinz Friedrich
Johannes Heilos
Assignee (at issue)
Degussa AG
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.