Granted Patent
Utility
US 6,338,906 · App. 09/438,202
Metal-infiltrated ceramic seal
Inventors:
Marcus A. Ritland, William Todd Howe
Patented Case
View Patent ↗
Granted: Jan 15, 2002
Filed: Nov 11, 1999
Inventors
Marcus A. Ritland
William Todd Howe
Assignee (at issue)
CoorsTek, Inc.
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.