Motorized toothbrush brush tip with two counter-rotating brush heads rotating on a common axis
US6751823B2 · kind B2 · utility
88Cited by
3References
34Claims
0Family size
Inventors
Key dates
| Filing date | Feb 25, 2002 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Feb 25, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C17/3436
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A brush tip for a motorized toothbrush has a first brush head and a second brush head. The second brush head encircles the first brush head. A shaft has two cranks, each engaging one of the brush heads. Continuous same-direction rotation of the shaft causes the brush heads to counter-rotate about a common axis. Distal ends of the first set of bristles on the first brush head form a circular pattern and the distal ends of the second set of bristles on the second brush head form an elliptical pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.