Granted Patent
Utility
US 6,209,445 · App. 09/146,786
Liner retainer assembly
Inventors:
Emmett T. Roberts, Thomas C. Leman
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Sep 3, 1998
Inventors
Emmett T. Roberts
Thomas C. Leman
Assignee (at issue)
SOUTHWEST OILFIELD PRODUCTS, 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.