Granted Patent
Utility
US 6,506,407 · App. 09/952,992
Colon-specific drug release system
Inventors:
Shunsuke Watanabe, Hitoshi Kawai, Masataka Katsuma, Muneo Fukui
Patented Case
View Patent ↗
Granted: Jan 14, 2003
Filed: Sep 14, 2001
Inventors
Shunsuke Watanabe
Hitoshi Kawai
Masataka Katsuma
Muneo Fukui
Assignee (at issue)
Yamanouchi Pharmaceutical 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.