Granted Patent
Utility
US 4,226,679 · App. 06/012,268
Latch mechanism for coke oven doors
Inventors:
Calvin E. Kelly, Thomas E. Nicely
Patented Case
View Patent ↗
Granted: Oct 7, 1980
Filed: Feb 15, 1979
Inventors
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.