Granted Patent
Utility
US 4,508,841 · App. 06/340,763
Process for producing porous refractory inorganic oxide products
Inventors:
Kazuhiko Onuma, Yoichi Kageyama, Hiromu Kobayashi, Akihiro Matsuki, Makoto Suzuki
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Jan 19, 1982
Inventors
Kazuhiko Onuma
Yoichi Kageyama
Hiromu Kobayashi
Akihiro Matsuki
Makoto Suzuki
Assignees (at issue)
Mitsubishi Chemical Industries, Ltd.
Asia Oil 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.