Granted Patent
Utility
US 6,699,503 · App. 09/702,880
Hydrogel-forming sustained-release preparation
Inventors:
Kazuhiro Sako, Hiroshi Nakashima, Toyohiro Sawada, Akira Okada, Muneo Fukui
Patented Case
View Patent ↗
Granted: Mar 2, 2004
Filed: Nov 1, 2000
Inventors
Kazuhiro Sako
Hiroshi Nakashima
Toyohiro Sawada
Akira Okada
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.