Granted Patent
Utility
US 6,563,141 · App. 09/673,177
Optical devices
Inventors:
Martin David Dawson, Robert William Martin
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Nov 29, 2000
Inventors
Martin David Dawson
Robert William Martin
Assignee (at issue)
BTG INTERNATIONAL 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.