Granted Patent
Utility
US 5,028,735 · App. 07/501,716
Purification and preparation processes for methyl methacrylate
Inventors:
Hirozo Segawa, Norio Ishikawa, Katsuji Yoguchi, Morimasa Kuragano, Minoru Koshibe
Patented Case
View Patent ↗
Granted: Jul 2, 1991
Filed: Mar 30, 1990
Inventors
Hirozo Segawa
Norio Ishikawa
Katsuji Yoguchi
Morimasa Kuragano
Minoru Koshibe
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.