Granted Patent
Utility
US 4,909,856 · App. 07/234,708
Composite coverglass for solar cell
Inventor:
Eugene L. Ralph
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Aug 22, 1988
Inventor
Eugene L. Ralph
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.