Granted Patent
Utility
US 6,554,886 · App. 09/933,657
Porous adsorbent and filter
Inventors:
Takayuki Yoshikawa, Masaki Fukuura, Shushi Nishimura
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Aug 22, 2001
Inventors
Takayuki Yoshikawa
Masaki Fukuura
Shushi Nishimura
Assignee (at issue)
KURARAY CHEMICAL 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.