Granted Patent
Utility
US 4,735,922 · App. 06/789,436
Porous refractory hard metal compositions and method of forming same
Inventor:
Siba P. Ray
Patented Case
View Patent ↗
Granted: Apr 5, 1988
Filed: Oct 21, 1985
Inventor
Siba P. Ray
Assignee (at issue)
Aluminum Company of America
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.