Granted Patent
Utility
US 4,715,196 · App. 07/033,818
Oil returning mechanism of evaporator for air conditioner
Inventor:
Hiroyuki Sugiura
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Apr 3, 1987
Inventor
Hiroyuki Sugiura
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.