Granted Patent
Utility
US 4,456,811 · App. 06/390,176
Method of and apparatus for heat treating axisymmetric surfaces with an annular laser beam
Inventors:
Richard A. Hella, John V. Staal
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Jun 21, 1982
Inventors
Richard A. Hella
John V. Staal
Assignee (at issue)
AVCO Everett Research Laboratory, 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.