Direct liquid-writing instrument
US8113732B2 · kind B2 · utility
2Cited by
5References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 11, 2008 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | Dec 15, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K7/105
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention provides a direct liquid-writing instrument without ink leakage from the pen-tip even after a long period of use. Specifically, it provides a direct liquid-writing instrument having an ink-retaining part in a bellows-like shape, in which at least the ink-retaining part in a bellows-like shape is made of: 20 to 95% by mass of (A) a polyamide-based resin; and 80 to 5% by mass of (B) at least one resin selected from a styrene-based resin, an olefin-based resin, and a polyphenylene ether resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.