Granted Patent
Utility
US 4,155,875 · App. 05/780,884
Method of softening caked catalyst
Inventors:
Kineo Yamaguchi, Katsuhiko Kawakami, Yukimasa Nakamoto
Patented Case
View Patent ↗
Granted: May 22, 1979
Filed: Mar 24, 1977
Inventors
Kineo Yamaguchi
Katsuhiko Kawakami
Yukimasa Nakamoto
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.