Granted Patent
Utility
US 4,515,181 · App. 06/497,985
Flow control valve assembly wth quick response
Inventor:
Joseph E. Dezelan
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: May 25, 1983
Inventor
Joseph E. Dezelan
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.