Granted Patent
Utility
US 4,775,505 · App. 07/036,458
Process for preparing a water repellent calcium silicate shaped product
Inventors:
Katsuhiko Kuroda, Toru Tagawa, Hiroo Katayama
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Apr 9, 1987
Inventors
Katsuhiko Kuroda
Toru Tagawa
Hiroo Katayama
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.