Granted Patent
Utility
US 4,894,837 · App. 07/273,210
Absorbing filter in pump cavity for control of beam quality
Inventors:
John C. DiFonzo, Bertram C. Johnson
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Nov 18, 1988
Inventors
John C. DiFonzo
Bertram C. Johnson
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.