Granted Patent
Utility
US 5,811,566 · App. 08/503,211
Process for purifying a polyether
Inventors:
Takashi Watabe, Hiroshi Hatano, Kazunori Chiba, Takao Doi, Toru Ueno, Etsuko Sakai, Minoru Yamada, Shinya Saiki, Hirotsugu Yamamoto, Toshihiko Higuchi
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Jul 17, 1995
Inventors
Takashi Watabe
Hiroshi Hatano
Kazunori Chiba
Takao Doi
Toru Ueno
Etsuko Sakai
Minoru Yamada
Shinya Saiki
Hirotsugu Yamamoto
Toshihiko Higuchi
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.