Granted Patent
Utility
US 5,444,031 · App. 08/007,169
Process for making catalytic carbon
Inventor:
Richard A. Hayden
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Jan 21, 1993
Inventor
Richard A. Hayden
Assignee (at issue)
CALGON CARBON 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.