Granted Patent
Utility
US 4,398,974 · App. 06/366,900
Temperature gradient zone melting process employing a buffer layer
Inventors:
Kuen Chow, Jan Grinberg
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Apr 9, 1982
Inventors
Kuen Chow
Jan Grinberg
Assignee (at issue)
Hughes Aircraft 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.