Granted Patent
Utility
US 6,798,813 · App. 09/901,857
Closed-loop purging system for laser
Inventors:
Yang Pang, Matthew Perry Philpott
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Jul 9, 2001
Inventors
Yang Pang
Matthew Perry Philpott
Assignee (at issue)
Coherent, 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.