Granted Patent
Utility
US 4,827,730 · App. 07/133,920
Troubleshooting apparatus for automobile air-conditioning system
Inventors:
Shigetoshi Doi, Yoshiaki Anan, Hirofumi Nagaoka, Katsumi Iida, Yoshihiko Sakurai
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Dec 16, 1987
Inventors
Shigetoshi Doi
Yoshiaki Anan
Hirofumi Nagaoka
Katsumi Iida
Yoshihiko Sakurai
Assignees (at issue)
Mazda Motor Corporation
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.