Granted Patent
Utility
US 4,816,121 · App. 06/929,522
Gas phase chemical reactor
Inventor:
Bowie G. Keefer
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Nov 12, 1986
Inventor
Bowie G. Keefer
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.