Granted Patent
Utility
US 5,643,607 · App. 08/458,679
Prolonged release microcapsules
Inventors:
Hiroaki Okada, Yayoi Inoue, Yasuaki Ogawa
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 2, 1995
Inventors
Hiroaki Okada
Yayoi Inoue
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.