Device for releasing a volatile substance in a controlled manner
US4158440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1976 |
| Grant date | Jun 19, 1979 |
| Priority date | — |
| Expiry date | Oct 12, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L9/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for releasing a volatile substance into the environment in a controlled manner comprises a reservoir of substance-absorbent material, for storing the substance, that is encapsulated in an envelope, at least a portion of which comprises a permeable material having porosity at least equal to ultramicroporosity. The permeable envelope portion has a greater affinity for the substance than does the reservoir material. The remainder of the envelope comprises a material impermeable to the substance. Accordingly, the substance permeates through the permeable envelope portion to be released therefrom in vapor form into the environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.