Toothbrush
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United States of America Patent
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-
Dec 18, 2001
Grant Date -
Jan 10, 2002
app pub date -
Jul 29, 1998
filing date -
Aug 1, 1997
priority date (Note) -
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Abstract
A toothbrush incorporating an indicator comprising a pressure indicating material which provides an optical signal without the provision of a power supply. Preferably, the pressure sensitive material is a piezochromic material, such as a liquid crystal cholesterol ester.
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