Granted Patent
Utility
US 4,193,793 · App. 05/850,008
Porous metal-alumina composite
Inventor:
Harry Cheung
Patented Case
View Patent ↗
Granted: Mar 18, 1980
Filed: Nov 9, 1977
Inventor
Harry Cheung
Assignee (at issue)
Union Carbide 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.