Granted Patent
Utility
US 5,154,905 · App. 07/814,051
Method for producing unsintered cristobalite particles
Inventors:
Iwao Ohshima, Koichi Orii, Naotake Watanabe, Yasumasa Yamaguchi
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Dec 26, 1991
Inventors
Iwao Ohshima
Koichi Orii
Naotake Watanabe
Yasumasa Yamaguchi
Assignee (at issue)
Nitto Chemical Industry 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.