Granted Patent
Utility
US 4,827,074 · App. 07/179,409
Method of thermally decomposing hydrocarbon and thermal decomposition tube
Inventors:
Akio Suwa, Nobuhisa Akiyoshi
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Apr 8, 1988
Inventors
Akio Suwa
Nobuhisa Akiyoshi
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
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.