Granted Patent
Utility
US 4,921,850 · App. 07/107,631
3-propenylcephem derivative
Inventors:
Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai, Takaharu Nakamura, Isao Sugiyama, Yoshimasa Machida, Seiichiro Nomoto, Kyosuke Kitoh, Kanemasa Katsu, Hiroshi Yamauchi
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Oct 13, 1987
Inventors
Takashi Kamiya
Toshihiko Naito
Shigeto Negi
Yuuki Komatu
Yasunobu Kai
Takaharu Nakamura
Isao Sugiyama
Yoshimasa Machida
Seiichiro Nomoto
Kyosuke Kitoh
Kanemasa Katsu
Hiroshi Yamauchi
Assignee (at issue)
Eisai Inc.
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.