Granted Patent
Utility
US 4,409,149 · App. 06/278,897
Process for producing catalyst precursors
Inventors:
Ernst Billig, David R. Bryant
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Jun 29, 1981
Inventors
Ernst Billig
David R. Bryant
Assignee (at issue)
Union Carbide Corporation
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.