Granted Patent
Utility
US 4,415,510 · App. 05/314,319
Process for making oxide refractory material having fine crystal structure
Inventor:
Wesley Q. Richmond
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Dec 12, 1972
Inventor
Wesley Q. Richmond
Assignee (at issue)
Kennecott Holdings 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.