Toothbrush
US5991957A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | May 19, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S15/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the case of conventional toothbrushes whose bristles have all needlelike tapering tips, the bristles near the tips become too thin and too flexible. In the case of toothbrushes whose bristle ends are all round or hemispherical, it is difficult to get into the spaces between teeth or boundary spaces between teeth and gums. Thus, it is difficult for conventional toothbrushes to clean up in every nook and corner in the mount. A toothbrush comprising a block head having brush portion, a handle and a neck portion connecting the block head with the handle, wherein a part of the tufts of the brush portion are made up of filament with polygonal cross section, and the rest of the tufts are made up of sheath-core structural filament whose core material is covered with sheath material such that the filaments are circular in cross-section, with the sheath material being concentric to the core material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.