Granted Patent
Utility
US 4,806,765 · App. 06/916,822
Method and apparatus for checking the signal path of a measuring system
Inventor:
Raymond Heinen
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Oct 9, 1986
Inventor
Raymond Heinen
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.