Granted Patent
Utility
US 4,190,439 · App. 05/624,401
Process for the preparation of fine grain metal carbide powders and sintered articles therefrom
Inventor:
Frank P. Gortsema
Patented Case
View Patent ↗
Granted: Feb 26, 1980
Filed: Oct 21, 1975
Inventor
Frank P. Gortsema
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.