Granted Patent
Utility
US 6,298,254 · App. 09/430,914
Device for sampling substances using alternating polarity of iontophoretic current
Inventor:
Janet Tamada
Patented Case
View Patent ↗
Granted: Oct 2, 2001
Filed: Nov 1, 1999
Inventor
Janet Tamada
Assignee (at issue)
Cygnus, 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.