Granted Patent
Utility
US 5,648,558 · App. 08/213,706
Method for producing a polyoxyalkylene glycol and novel metallo-aluminosilicate
Inventors:
Masakatsu Hatano, Akio Nakanishi, Yoshio Kabata, Masayuki Shirado, Hiroshi Takeo, Mitsuharu Kobayashi
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Mar 16, 1994
Inventors
Masakatsu Hatano
Akio Nakanishi
Yoshio Kabata
Masayuki Shirado
Hiroshi Takeo
Mitsuharu Kobayashi
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.