Granted Patent
Utility
US 4,987,252 · App. 07/211,903
Quenching process of reaction product gas containing methacrylic acid and treatment method of quenched liquid
Inventors:
Morimasa Kuragano, Kozo Iwasaki, Takeshi Isobe, Isao Fukada, Minoru Koshibe, Yoshihiro Sezaki, Hirozo Segawa, Katsuji Yoguchi
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Jun 27, 1988
Inventors
Morimasa Kuragano
Kozo Iwasaki
Takeshi Isobe
Isao Fukada
Minoru Koshibe
Yoshihiro Sezaki
Hirozo Segawa
Katsuji Yoguchi
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
Kyowa Gas Chemical Industry 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.