Granted Patent
Utility
US 4,962,300 · App. 06/239,608
Preheating control apparatus for diesel engines
Inventor:
Kiyoshi Watanabe
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Mar 2, 1981
Inventor
Kiyoshi Watanabe
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.