Granted Patent
Utility
US 6,763,891 · App. 10/201,704
Production tree with multiple safety barriers
Inventors:
Bernard Humphrey, Jeffrey Paul Goetz, Kevin L. Ingram, Norman Brammer, Robert K. Voss
Patented Case
View Patent ↗
Granted: Jul 20, 2004
Filed: Jul 23, 2002
Inventors
Bernard Humphrey
Jeffrey Paul Goetz
Kevin L. Ingram
Norman Brammer
Robert K. Voss
Assignee (at issue)
ABB Vetco Gray Inc.
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.