Granted Patent
Utility
US 6,544,669 · App. 09/939,301
Cryogenic treatment of cookware and bakeware
Inventor:
William A. Groll
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Aug 24, 2001
Inventor
William A. Groll
Assignee (at issue)
Clad Metals LLC
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.