Granted Patent
Utility
US 6,354,813 · App. 09/544,242
Hydraulically activated three-way-valve
Inventor:
Karsten Laing
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Apr 5, 2000
Inventor
Karsten Laing
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.