Granted Patent
Utility
US 4,748,196 · App. 06/908,795
Water repellent composition
Inventors:
Katsuhiko Kuroda, Toru Tagawa, Kiyoharu Yoshimi, Yasoji Ozawa
Patented Case
View Patent ↗
Granted: May 31, 1988
Filed: Sep 18, 1986
Inventors
Katsuhiko Kuroda
Toru Tagawa
Kiyoharu Yoshimi
Yasoji Ozawa
Assignees (at issue)
Mitsubishi Chemical Industries, Ltd.
Yoshino Gpysum Company, 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.