Granted Patent
Utility
US 4,297,147 · App. 06/143,333
Method for decoking fired heater tubes
Inventors:
David J. Nunciato, Norman Henry White, William A. Woodburn
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Apr 24, 1980
Inventors
David J. Nunciato
Norman Henry White
William A. Woodburn
Assignee (at issue)
Union Carbide 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.