Granted Patent
Utility
US 6,311,516 · App. 09/492,189
Process and apparatus for C3 recovery
Inventors:
Ronald D. Key, Steven C. Brantingham
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Jan 27, 2000
Inventors
Ronald D. Key
Steven C. Brantingham
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.