Granted Patent
Utility
US 4,286,792 · App. 06/128,797
Self-replenishing seal for the gas offtake piping of a coke oven and sealing method
Inventors:
Robert E. Hagedorn, Alphonse T. Lobue, Joseph G. Uhlman
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Mar 10, 1980
Inventors
Robert E. Hagedorn
Alphonse T. Lobue
Joseph G. Uhlman
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.