Granted Patent
Utility
US 5,869,972 · App. 08/807,008
Testing device using a thermochromic display and method of using same
Inventors:
Brian Jeffrey Birch, Edward Baginski, Nicholas Andrew Morris, Catherine Lovell, Michael Catt, Miles Hugh Eddowes
Patented Case
View Patent ↗
Granted: Feb 9, 1999
Filed: Feb 26, 1997
Inventors
Brian Jeffrey Birch
Edward Baginski
Nicholas Andrew Morris
Catherine Lovell
Michael Catt
Miles Hugh Eddowes
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.