Granted Patent
Utility
US 4,557,237 · App. 06/593,989
Bypass restrictor for distribution valve
Inventors:
Fred R. Bally, Donald J. Waldman
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Mar 27, 1984
Inventors
Fred R. Bally
Donald J. Waldman
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.