Granted Patent
Utility
US 4,237,774 · App. 06/094,257
Displacement control valving for a radial piston device
Inventor:
William K. Engel
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jul 16, 1979
Inventor
William K. Engel
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.