Granted Patent
Utility
US 4,891,820 · App. 07/070,014
Fast axial flow laser circulating system
Inventors:
Joseph F. Rando, Dale E. Koop
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Jul 6, 1987
Inventors
Joseph F. Rando
Dale E. Koop
Assignee (at issue)
Rofin-Sinar, 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.