Granted Patent
Utility
US 4,895,890 · App. 07/332,380
Calcium silicate shaped product
Inventors:
Takeo Sawanobori, Mitsuru Swata, Noriyuki Ariyama, Yuji Noguchi
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Apr 3, 1989
Inventors
Takeo Sawanobori
Mitsuru Swata
Noriyuki Ariyama
Yuji Noguchi
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.