Granted Patent
Utility
US 5,047,428 · App. 07/365,368
Expectorant comprising hydroxyalkylcysteine derivative
Inventors:
Yoshikuni Itoh, Hiroyuki Mizuno, Chikako Kiyohara, Susumu Sato, Tatsuhiko Katori
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: Jun 13, 1989
Inventors
Yoshikuni Itoh
Hiroyuki Mizuno
Chikako Kiyohara
Susumu Sato
Tatsuhiko Katori
Assignee (at issue)
SS 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.