Granted Patent
Utility
US 5,228,955 · App. 07/886,804
High strength coke oven wall having gas flues therein
Inventor:
Richard Westbrook
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: May 22, 1992
Inventor
Richard Westbrook
Assignee (at issue)
Sun Coal Company
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.