Granted Patent
Utility
US 5,342,533 · App. 07/940,196
Refrigerator oil composition
Inventors:
Yasuo Kondo, Yukiharu Beppu, Kazuo Tagawa
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Sep 2, 1992
Inventors
Yasuo Kondo
Yukiharu Beppu
Kazuo Tagawa
Assignees (at issue)
Mitsubishi Oil Co., Ltd.
MITSUBISHI ELECTRIC 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.