Granted Patent
Utility
US 4,469,133 · App. 06/555,459
Engine coolant flow controlling valve
Inventors:
Hans Boesing, Dieter Gabler
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Nov 14, 1983
Inventors
Hans Boesing
Dieter Gabler
Assignee (at issue)
RANCO 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.