Granted Patent
Utility
US 4,582,694 · App. 06/623,180
Shock calcined crystalline silica catalysts
Inventor:
Dean A. Young
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Jun 21, 1984
Inventor
Dean A. Young
Assignee (at issue)
Union Oil Company of California
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.