Pencil lead
US11072722B2 · kind B2 · utility
0Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2018 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Jul 28, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K7/22
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A pencil lead and a pencil containing the pencil lead wherein the pencil lead is polymer-based, extrudable, non-expanded, non-calcined and comprises graphite, of which 25% to 100% by weight or 50% to 100% by weight of the graphite, in relation to the total weight of the graphite, is expanded graphite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.