Granted Patent
Utility
US 4,196,170 · App. 05/909,752
Multistage catalytic reactor having a pressure responsive gas flow control valve therein
Inventor:
Richard A. Cemenska
Patented Case
View Patent ↗
Granted: Apr 1, 1980
Filed: May 26, 1978
Inventor
Richard A. Cemenska
Assignee (at issue)
Caterpillar Tractor Co.
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.