Container with microporous membrane for dispensing vapor from volatile liquid
US4917301A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Nov 15, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/88
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Volatile substances such as fragrances, perfumes, deodorizers, room freshener compositions and the like are dispensed in vapor phase from a container holding the substance in liquid phase at room temperature under atmospheric pressure. The container has a window covered with a microporous membrane with an active structure formed from a material having a critical surface tension that is below the surface tension of the liquid substance. The active membrane material has a critical surface tension that is below 22 dynes/cm and preferably below 20 dynes/cm while the surface tension of the liquid is at least 22 dynes/cm. One example is an ultraviolet irradiated polymer composition with 0.2 microns nominal pore size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.