Granted Patent
Utility
US 5,271,945 · App. 07/746,203
Sustained release microcapsule for water soluble drug
Inventors:
Toshio Yoshioka, Hiroaki Okada, Yasuaki Ogawa
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Aug 15, 1991
Inventors
Toshio Yoshioka
Hiroaki Okada
Yasuaki Ogawa
Assignee (at issue)
Takeda Chemical Industries 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.