Granted Patent
Utility
US 6,253,579 · App. 09/275,562
Valve hamper assembly
Inventors:
Terry E. Hartman, Herbert C. Kroh, David E. Crots
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Mar 24, 1999
Inventors
Terry E. Hartman
Herbert C. Kroh
David E. Crots
Assignee (at issue)
LIBBEY GLASS 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.