Granted Patent
Utility
US 6,504,642 · App. 09/663,103
Birefringent optical device
Inventors:
Richard D. Albert, Arne Erstling, Desmond Laurence Seekola, Brent Bergner, Michael Knotz
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: Sep 15, 2000
Inventors
Richard D. Albert
Arne Erstling
Desmond Laurence Seekola
Brent Bergner
Michael Knotz
Assignee (at issue)
Spectraswitch, Inc.
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.