Granted Patent
Utility
US 4,533,439 · App. 06/499,071
Apparatus and method of using a fuel gas regulator for a coke oven battery
Inventors:
Douglas M. Dickerson, Robert W. Fikes
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: May 27, 1983
Inventors
Douglas M. Dickerson
Robert W. Fikes
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.