Granted Patent
Utility
US 4,322,101 · App. 06/092,615
Adjustable spring latch for coke oven doors or the like
Inventors:
Calvin E. Kelly, Thomas E. Nicely
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Nov 8, 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.