Toothbrush
US4847936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Jan 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S15/05
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A toothbrush in which the bristles define a surface across the width of the handle having a convex portion along the midline of the handle and concave portions on either side of the convex portion, thereby to conform to the corresponding complementary surface portions of the molars. In a preferred embodiment the bristles are longest along the center of the handle and shortest along the sides of the handle. To facilitate gripping, the handle has a cross-section that is concave along the front of the handle and of uniform thickness across the width of the handle. To minimize displacement of the handle when brushing various portions of the teeth, the handle is rearwardly curved along the lower portion thereof and is forwardly curved along the upper portion thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.