Granted Patent
Utility
US 5,399,203 · App. 08/046,308
Method for cleaning oil-deposited material
Inventors:
Makoto Ishikawa, Tetsuhiro Yamauchi, Kazunari Takahashi, Soichi Orita, Tetsuo Asanuma, Noboru Ueki, Masayuki Hattori, Satoshi Yamazaki
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Apr 15, 1993
Inventors
Makoto Ishikawa
Tetsuhiro Yamauchi
Kazunari Takahashi
Soichi Orita
Tetsuo Asanuma
Noboru Ueki
Masayuki Hattori
Satoshi Yamazaki
Assignee (at issue)
Mitsubishi Kasei 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.