Granted Patent
Utility
US 4,290,709 · App. 06/079,887
High taper angle connecting pin for graphite electrode joints
Inventors:
Emanuel J. Seldin, Tu-Lung Weng
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Sep 28, 1979
Inventors
Emanuel J. Seldin
Tu-Lung Weng
Assignee (at issue)
Union Carbide 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.