Granted Patent
Utility
US 6,752,212 · App. 10/443,522
Dump valve assembly for selective draining of liquid from an oil well pipe stream
Inventors:
Mark Burris, Donald R. Hibler, Jr.
Patented Case
View Patent ↗
Granted: Jun 22, 2004
Filed: May 22, 2003
Inventors
Mark Burris
Donald R. Hibler, Jr.
Assignee (at issue)
Fike Corporation
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.