Granted Patent
Utility
US 5,654,831 · App. 08/368,447
Refractive ellipsoid optical surface without spherical aberration
Inventors:
Robert W. Byren, James E. Klein
Patented Case
View Patent ↗
Granted: Aug 5, 1997
Filed: Jan 4, 1995
Inventors
Robert W. Byren
James E. Klein
Assignee (at issue)
HUGHES ELECTRONICS LIMITED
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.