Granted Patent
Utility
US 6,089,414 · App. 08/949,837
Pump assembly with one piece piston
Inventors:
Donald J. Shanklin, Ronald F. Englhard
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Oct 14, 1997
Inventors
Donald J. Shanklin
Ronald F. Englhard
Assignee (at issue)
Hayes Products, LLC.
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.