Granted Patent
Utility
US 5,605,873 · App. 08/319,018
Pressure-sensitive verification system and use thereof
Inventor:
John C. H. Chang
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Oct 6, 1994
Inventor
John C. H. Chang
Assignee (at issue)
Wallace Computer Services, 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.