Color lead for a writing device, drawing device or painting device
US7803220B2 · kind B2 · utility
1Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 14, 2007 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Aug 29, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K19/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An unburnt color lead for writing devices, drawing devices and painting devices, includes at least one coloring material, at least one binder, at least one organic lubricant which is solid at room temperature, and at least one filler material whose particles essentially have a disk-shaped configuration. The color lead contains 20 to 80 weight % of the at least one filler material, and the color lead contains at least 20 weight % hexagonal bornitride as a first filler material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.