Granted Patent
Utility
US 4,388,257 · App. 06/227,696
Process for preparing calcium silicate shaped product
Inventors:
Yasuo Oguri, Mitsuru Awata, Mitsunobu Abe
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jan 23, 1981
Inventors
Yasuo Oguri
Mitsuru Awata
Mitsunobu Abe
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.