Granted Patent
Utility
US 4,522,937 · App. 06/649,238
Preparative process for alkaline earth metal, aluminum-containing spinels
Inventors:
Jin S. Yoo, John A. Karch, Richard F. Poss, Emmett H. Burk, Jr.
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Sep 10, 1984
Inventors
Jin S. Yoo
John A. Karch
Richard F. Poss
Emmett H. Burk, Jr.
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.