Granted Patent
Utility
US 6,089,269 · App. 09/325,863
Partially stroking an emergency valve
Inventor:
Derek Mark Essam
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Jun 4, 1999
Inventor
Derek Mark Essam
Assignee (at issue)
Drallim Industries Limited
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.