Granted Patent
Utility
US 4,900,698 · App. 07/054,470
Ceramic product and process
Inventor:
Christian B. Lundsager
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: May 26, 1987
Inventor
Christian B. Lundsager
Assignee (at issue)
W.R. Grace & Co. Conn.
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.