Granted Patent
Utility
US 4,255,357 · App. 06/132,838
Catalytic process for preparing ethyl amines
Inventors:
David A. Gardner, Roger T. Clark
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Mar 24, 1980
Inventors
David A. Gardner
Roger T. Clark
Assignee (at issue)
Pennwalt 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.