Granted Patent
Utility
US 4,415,401 · App. 06/216,300
Control of atmosphere surrounding crystal growth zone
Inventors:
Fritz Wald, Juris P. Kalejs
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Dec 15, 1980
Inventors
Fritz Wald
Juris P. Kalejs
Assignee (at issue)
Mobil Solar Energy Corporation
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.