Granted Patent
Utility
US 4,772,580 · App. 06/936,501
Catalyst carrier of cordierite honeycomb structure and method of producing the same
Inventors:
Toshiyuki Hamanaka, Keiichiro Watanabe, Takashi Harada, Seiichi Asami
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Dec 1, 1986
Inventors
Toshiyuki Hamanaka
Keiichiro Watanabe
Takashi Harada
Seiichi Asami
Assignee (at issue)
NGK INSULATORS, 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.