Granted Patent
Utility
US 6,412,628 · App. 09/532,476
Apparatus for preventing the formation of metal tarnish
Inventor:
Walter G. Tramposch
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Mar 22, 2000
Inventor
Walter G. Tramposch
Assignee (at issue)
CALGON CARBON CORPORATION
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.