Granted Patent
Utility
US 6,044,908 · App. 09/087,759
Sliding sleeve valve and seal ring for use therein
Inventor:
Mark L. Wyatt
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: May 29, 1998
Inventor
Mark L. Wyatt
Assignee (at issue)
GRANT PRIDECO, 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.