Granted Patent
Utility
US 5,063,196 · App. 07/371,430
Chromium-free impregnated activated carbon for adsorption of toxic gases and/or vapors
Inventors:
David T. Doughty, James E. Groose
Patented Case
View Patent ↗
Granted: Nov 5, 1991
Filed: Jun 23, 1989
Inventors
David T. Doughty
James E. Groose
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.