Granted Patent
Utility
US 4,488,409 · App. 06/527,735
Trouble diagnosing apparatus for an automobile air conditioner
Inventor:
Toshizo Hara
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Aug 30, 1983
Inventor
Toshizo Hara
Assignee (at issue)
Diesel Kiki Co., 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.