Granted Patent
Utility
US 4,246,396 · App. 06/090,472
Process for producing polyoxymethylene
Inventors:
Ikuo Sukegawa, Seiichi Nozawa, Seiichi Mukai, Masaharu Shikama
Patented Case
View Patent ↗
Granted: Jan 20, 1981
Filed: Nov 1, 1979
Inventors
Ikuo Sukegawa
Seiichi Nozawa
Seiichi Mukai
Masaharu Shikama
Assignee (at issue)
Mitsubishi Chemical Industries, 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.