Granted Patent
Utility
US 5,114,605 · App. 07/605,273
Lubricant oil for refrigerators
Inventors:
Kinya Mizui, Yoshiaki Furuya
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Oct 30, 1990
Inventors
Kinya Mizui
Yoshiaki Furuya
Assignee (at issue)
Mitsui Petrochemical 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.