Granted Patent
Utility
US 6,813,988 · App. 10/365,588
Sequential hydraulic extension system
Inventors:
Leonard Kruppa, Scott Jones, Marlin Ritchie, Mark Kosel
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Feb 12, 2003
Inventors
Leonard Kruppa
Scott Jones
Marlin Ritchie
Mark Kosel
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.