Granted Patent
Utility
US 5,959,142 · App. 08/550,801
Process for refining methacrylic acid
Inventors:
Kazuo Wakimura, Tadaharu Hase, Yoshihiro Sezaki, Koji Fujita, Takeshi Isobe, Shin-ichi Tadokoro, Rensuke Ikarashi
Patented Case
View Patent ↗
Granted: Sep 28, 1999
Filed: Oct 31, 1995
Inventors
Kazuo Wakimura
Tadaharu Hase
Yoshihiro Sezaki
Koji Fujita
Takeshi Isobe
Shin-ichi Tadokoro
Rensuke Ikarashi
Assignees (at issue)
MITSUI CHEMICALS, INC.
KURARAY 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.