Granted Patent
Utility
US 4,684,204 · App. 06/830,671
Electron source assembly with a replaceable filament ribbon
Inventors:
Bruce S. Johnson, Dennis M. Taylor
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Feb 18, 1986
Inventors
Bruce S. Johnson
Dennis M. Taylor
Assignee (at issue)
Finnigan Corporation
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.