Transparent or translucent tubular structure
US6742952B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2003 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Feb 28, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S138/03
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A writing medium reservoir that exhibits clear drain of a writing medium, and preferably in which the writing medium is readily visible to the user. A method of making a writing medium reservoir that exhibits clear drain of a writing medium, and preferably in which the writing medium is readily visible to the user. The method may include forming the writing medium reservoir by co-extruding an inner layer and an outer layer. In addition, the present invention relates to a multi-layer tubular structure that exhibits clear drain of a liquid, and preferably in which the relative presence or relative absence of liquid is readily visible to the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.