Granted Patent
Utility
US 6,210,458 · App. 09/220,348
Gas filter module having two-part filter and method of producing the same
Inventors:
Toyohiko Shindo, Koichi Imura, Takafumi Imaizumi, Hiroyuki Ichikawa, Kazuyuki Ohshima, Takeshi Iwasaki
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Dec 24, 1998
Inventors
Toyohiko Shindo
Koichi Imura
Takafumi Imaizumi
Hiroyuki Ichikawa
Kazuyuki Ohshima
Takeshi Iwasaki
Assignee (at issue)
Toshiba Ceramics 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.