Granted Patent
Utility
US 5,665,394 · App. 08/723,152
Matrix for sustained-release preparation
Inventors:
Yasutaka Igari, Akira Saikawa, Kayoko Okamoto, Shigeru Kamei, Masahisa Oka, Atsunori Sano
Patented Case
View Patent ↗
Granted: Sep 9, 1997
Filed: Sep 30, 1996
Inventors
Yasutaka Igari
Akira Saikawa
Kayoko Okamoto
Shigeru Kamei
Masahisa Oka
Atsunori Sano
Assignees (at issue)
Takeda Chemical Industries Ltd.
WAKO PURE 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.