Granted Patent
Utility
US 5,194,464 · App. 07/497,655
Enteric film and preparatoin thereof
Inventors:
Shunichi Itoh, Hiroyoshi Koyama, Toshio Kashihara, Shin-ichiro Hirai
Patented Case
View Patent ↗
Granted: Mar 16, 1993
Filed: Mar 23, 1990
Inventors
Shunichi Itoh
Hiroyoshi Koyama
Toshio Kashihara
Shin-ichiro Hirai
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.