Granted Patent
Utility
US 4,304,413 · App. 06/128,796
Seal for the gas offtake piping of a coke oven
Inventors:
Paul E. Champagne, Calvin E. Kelly, Thomas E. Nicely
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Mar 10, 1980
Inventors
Paul E. Champagne
Calvin E. Kelly
Thomas E. Nicely
Assignee (at issue)
United States Steel 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.