Granted Patent
Utility
US 6,565,746 · App. 10/134,693
One-piece self-venting drain valve
Inventors:
Willie L. Stamey, Jr., Mark A. Roll
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Apr 30, 2002
Inventors
Willie L. Stamey, Jr.
Mark A. Roll
Assignee (at issue)
DANA LIMITED
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.