Toothbrush
US6389636B1 · kind B1 · utility
23Cited by
12References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA46B15/0002
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A toothbrush incorporates an indicator comprising a pressure indicating material which provides an optical signal without the provision of a power supply and wherein the signal is provided when the correct brushing pressure is being applied. Preferably, the pressure sensitive material is a piezochromic material, such as a liquid crystal cholesterol ester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.