Ball point pen filled with erasable ink
US5977211A · kind A · utility
18Cited by
12References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1998 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Jan 9, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A ball point pen filled with an erasable ink which comprises a resin or rubber having a filming temperature of 0.degree. C. or lower or a glass transition temperature of 0.degree. C. or lower, pigment particles and water. The erasability and the writing feeling are improved by further blending the ink with a gelatinizer and a lubricant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.