Granted Patent
Utility
US 5,075,449 · App. 07/480,852
Method of optically resolving (.+-.)-1-(3-pyridylcarbonyl)-5-methyl-2-pyrazoline
Inventors:
Seitaro Kajiya, Hajime Iizuka, Kunio Okumura, Junya Fujiwara, Norio Ohto, Hiroshi Kawazura, Yasuhiro Takahashi, Yoshio Shiga
Patented Case
View Patent ↗
Granted: Dec 24, 1991
Filed: Feb 16, 1990
Inventors
Seitaro Kajiya
Hajime Iizuka
Kunio Okumura
Junya Fujiwara
Norio Ohto
Hiroshi Kawazura
Yasuhiro Takahashi
Yoshio Shiga
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.