Granted Patent
Utility
US 6,062,540 · App. 09/189,348
Double seal drain cock
Inventor:
William T. Hubler
Patented Case
View Patent ↗
Granted: May 16, 2000
Filed: Nov 10, 1998
Inventor
William T. Hubler
Assignee (at issue)
THOMAS INDUSTRIES, 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.