Granted Patent
Utility
US 4,990,529 · App. 07/334,249
Pyrazolone derivatives for treating cerebrovascular diseases
Inventors:
Hiroyuki Yamashita, Makoto Odate, Hajime Iizuka, Hiroshi Kawazura, Yoshio Shiga, Hiroshi Namekawa
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Apr 6, 1989
Inventors
Hiroyuki Yamashita
Makoto Odate
Hajime Iizuka
Hiroshi Kawazura
Yoshio Shiga
Hiroshi Namekawa
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.