Granted Patent
Utility
US 6,458,340 · App. 09/438,663
Desensitizing bleaching gel
Inventors:
Robert L. Ibsen, Alan B. Mathews, Thomas C. Chadwick, Xinyi Yu
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Nov 12, 1999
Inventors
Robert L. Ibsen
Alan B. Mathews
Thomas C. Chadwick
Xinyi Yu
Assignee (at issue)
Den-Mat Holdings, 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.