Granted Patent
Utility
US 6,484,804 · App. 09/932,897
Pumpdown valve plug assembly for liner cementing system
Inventors:
Jerry P. Allamon, Jack E. Miller
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Aug 20, 2001
Inventors
Jerry P. Allamon
Jack E. Miller
Assignees (at issue)
Jerry P. Allamon
Shirley C. Allamon
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.