Granted Patent
Utility
US 4,664,679 · App. 06/802,013
Aqueous dispersion of silicic anhydride and abrasive composition comprising the dispersion
Inventors:
Katsuhisa Kohyama, Tsuneo Kimura, Teruo Kidera, Yukio Kajiwara
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Nov 25, 1985
Inventors
Katsuhisa Kohyama
Tsuneo Kimura
Teruo Kidera
Yukio Kajiwara
Assignee (at issue)
Mitsubishi Chemical Industries, 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.