Granted Patent
Utility
US 6,261,982 · App. 09/437,443
Cordierite ceramic filter
Inventors:
Hideo Takahashi, Akira Mitsui
Patented Case
View Patent ↗
Granted: Jul 17, 2001
Filed: Nov 10, 1999
Inventors
Hideo Takahashi
Akira Mitsui
Assignee (at issue)
ASAHI GLASS CO., 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.