Granted Patent
Utility
US 4,985,253 · App. 07/481,722
Sustained release composition for pharmaceutical substances comprising a silicone elastomer carrier
Inventors:
Keiji Fujioka, Shigeji Sato, Nobuhiko Tamura, Yoshihiro Takada
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Feb 16, 1990
Inventors
Keiji Fujioka
Shigeji Sato
Nobuhiko Tamura
Yoshihiro Takada
Assignee (at issue)
Sumitomo Pharmaceuticals Company Limited
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.