Writing or coloring pencil
US10814665B2 · kind B2 · utility
5Cited by
4References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2017 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Aug 5, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D13/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A writing or coloring pencil has three layers obtained by co-extrusion, including an unexpanded polymer-based lead, an unexpanded intermediate protective layer surrounding the lead and comprising an ethylene (C1-C4 alkyl) acrylate copolymer, alone or as a blend with a styrene polymer, and an expanded styrene polymer-based synthetic wood material surrounding the intermediate protective layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.