Pencil lead for writing, drawing and/or painting devices
US8362109B2 · kind B2 · utility
1Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2009 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Oct 2, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D13/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A polymer-bonded pencil lead for writing, drawing, and/or painting devices, including at least one polymer binder, one wax, and at least one filler. The pencil lead includes 0.5 to 2.5% by weight palm oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.