Granted Patent
Utility
US 4,308,173 · App. 06/132,955
Catalyst for cracking heavy hydrocarbons
Inventors:
Kuniaki Fujimori, Teruo Suzuka, Yukio Inoue, Shirou Aizawa
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Mar 24, 1980
Inventors
Kuniaki Fujimori
Teruo Suzuka
Yukio Inoue
Shirou Aizawa
Assignee (at issue)
Nippon Mining Company Limited
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.