Granted Patent
Utility
US 6,440,898 · App. 09/530,297
Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules
Inventor:
Erich Kranz
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Apr 27, 2000
Inventor
Erich Kranz
Assignee (at issue)
Mitsubishi HiTec Paper Flensburgh GmbH
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.