Granted Patent
Utility
US 5,300,699 · App. 08/045,206
Process for preparing bisphenol A of good heat stability
Inventors:
Toshihiko Furukawa, Katsuhiko Sakura, Kiyoshi Hashimoto, Nobuaki Egashira, Nobuo Moriya, Sachio Asaoka, Nobuyuki Suda, Susumu Yamamoto
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Apr 13, 1993
Inventors
Toshihiko Furukawa
Katsuhiko Sakura
Kiyoshi Hashimoto
Nobuaki Egashira
Nobuo Moriya
Sachio Asaoka
Nobuyuki Suda
Susumu Yamamoto
Assignees (at issue)
NIPPON STEEL CHEMICAL CO., LTD.
CHIYODA CORPORATION
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.