Granted Patent
Utility
US 5,144,486 · App. 07/590,677
Laser beam apparatus for providing multiple reference beams
Inventor:
Edward E. Hart
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: Oct 1, 1990
Inventor
Edward E. Hart
Assignee (at issue)
Spectra-Physics Laserplane, 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.