Granted Patent
Utility
US 4,174,973 · App. 06/007,097
Transparent yttria ceramics containing magnesia or magnesium aluminate
Inventors:
William H. Rhodes, F. Joseph Reid
Patented Case
View Patent ↗
Granted: Nov 20, 1979
Filed: Jan 29, 1979
Inventors
William H. Rhodes
F. Joseph Reid
Assignee (at issue)
GTE Laboratories Incorporated
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.