Granted Patent
Utility
US 6,637,515 · App. 09/827,675
Method and apparatus for reducing plunger seal wear on automatic casing swab lift systems
Inventors:
Ronald Bishop, David P. Gregg
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Apr 6, 2001
Inventors
Ronald Bishop
David P. Gregg
Assignee (at issue)
ConocoPhillips Company
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.