Granted Patent
Utility
US 4,476,245 · App. 06/445,306
Preparative process for alkaline earth metal, aluminum-containing spinels
Inventor:
Kristine S. Siefert
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Nov 29, 1982
Inventor
Kristine S. Siefert
Assignee (at issue)
Atlantic Richfield Company
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.