Granted Patent
Utility
US 4,678,288 · App. 06/604,916
Trifocal lens for a laser instrument
Inventors:
Randall Joel Lonsdale, Ronald A. Hellekson
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Apr 27, 1984
Inventors
Randall Joel Lonsdale
Ronald A. Hellekson
Assignee (at issue)
Spectra-Physics, 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.