Granted Patent
Utility
US 5,011,875 · App. 07/501,389
Corrosion resistant, water expandable composition
Inventors:
Yuji Yamamoto, Hideyuki Shigematsu, Hiroshi Tanaka, Ryo Ashikawa, Tatsuo Ishida
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Mar 26, 1990
Inventors
Yuji Yamamoto
Hideyuki Shigematsu
Hiroshi Tanaka
Ryo Ashikawa
Tatsuo Ishida
Assignees (at issue)
Hiroshima Kasei Ltd
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
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.