Granted Patent
Utility
US 4,454,715 · App. 06/278,493
Fluid control system
Inventors:
Thomas Müller, Leon A. Wirt
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: May 22, 1981
Inventors
Thomas Müller
Leon A. Wirt
Assignee (at issue)
Caterpillar Tractor Co.
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.