Granted Patent
Utility
US 4,977,113 · App. 07/351,660
Process for producing silicon aluminum oxynitride by carbothermic reaction
Inventors:
Frankie E. Phelps, Gerald W. Leech
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: May 15, 1989
Inventors
Frankie E. Phelps
Gerald W. Leech
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.