Granted Patent
Utility
US 4,020,120 · App. 05/638,742
Modified zinc ferrite oxidative dehydrogenation catalysts
Inventors:
Harold F. Christmann, Edward J. Miklas
Patented Case
View Patent ↗
Granted: Apr 26, 1977
Filed: Dec 8, 1975
Inventors
Harold F. Christmann
Edward J. Miklas
Assignee (at issue)
Petro-Tex Chemical 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.