Granted Patent
Utility
US 4,889,961 · App. 07/230,564
Graphite trace electrical interconnect
Inventor:
Jerrold L. Carlson
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Aug 10, 1988
Inventor
Jerrold L. Carlson
Assignee (at issue)
E.F. Johnson Company
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.