Granted Patent
Utility
US 5,397,498 · App. 08/204,886
Method for cleaning molding machine in which residual thermoplastic resins remain and cleaning composition therefor
Inventors:
Yuzuru Ishida, Masahiro Mitsuboshi, Ichirou Otsuka, Haruo Inoue
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Mar 2, 1994
Inventors
Yuzuru Ishida
Masahiro Mitsuboshi
Ichirou Otsuka
Haruo Inoue
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.