Envelope device containing a liquid volatile material and method for making such a device
US6746750B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 2000 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Jun 19, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention provides a generally planar closed envelope device formed from material having vapor barrier properties, which envelope comprises a base layer (1) and a cover layer (4) applied to the base layer (1) and a continuous or discontinuous seal (4) therebetween, characterized in that: a) each of the base (1) and cover (3) layers carries a fluid composition (2) containing a liquid volatile material upon a selected area of the opposed faces thereof; f) the base (1) and cover (3) layers are formed by folding over a single piece of sheet material so as to bring the selected areas of the base (1) and cover (3) layers into opposing register with one another; and g) there is separable and reformable seal (4) between the base (1) and cover (3) layers to retain them in the folded configuration. The invention also provides a method for making such a device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.