Granted Patent
Utility
US 4,157,375 · App. 05/891,503
Conversion of nitrogen oxides
Inventors:
Stanley M. Brown, Gerald M. Woltermann
Patented Case
View Patent ↗
Granted: Jun 5, 1979
Filed: Mar 30, 1978
Inventors
Stanley M. Brown
Gerald M. Woltermann
Assignee (at issue)
Engelhard Minerals & Chemicals 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.