Granted Patent
Utility
US 4,921,283 · App. 07/355,404
Connection of carbon or graphite tubes
Inventors:
Kurt Schaffner, Adolf Swozil, Gerhard Ullmann
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: May 22, 1989
Inventors
Kurt Schaffner
Adolf Swozil
Gerhard Ullmann
Assignee (at issue)
Sigri 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.