Granted Patent
Utility
US 6,425,331 · App. 09/206,262
Permanent heat activated printing process
Inventors:
Ming Xu, Nathan Hale
Patented Case
View Patent ↗
Granted: Jul 30, 2002
Filed: Oct 27, 1998
Inventors
Ming Xu
Nathan Hale
Assignee (at issue)
Sawgrass Systems, 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.