Granted Patent
Utility
US 5,236,763 · App. 07/893,014
Method for engraving solid articles with laser beams and the articles produced
Inventor:
Pierre Luthi
Patented Case
View Patent ↗
Granted: Aug 17, 1993
Filed: Jun 3, 1992
Inventor
Pierre Luthi
Assignee (at issue)
Praxair S.T. Technology, 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.