Granted Patent
Utility
US 4,677,273 · App. 06/907,366
Electron beam welding apparatus
Inventors:
Russell K. Colegrove, William Stone
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Sep 12, 1986
Inventors
Russell K. Colegrove
William Stone
Assignee (at issue)
Leybold-Heraeus GmbH
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.