Granted Patent
Utility
US 4,290,874 · App. 06/162,754
Gasket for sealing joints in carbonaceous elements in electrolysis cell
Inventors:
Matthew J. McMonigle, Chester H. Klingensmith
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Jun 25, 1980
Inventors
Matthew J. McMonigle
Chester H. Klingensmith
Assignee (at issue)
Aluminum Company of America
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.