Gas driven dispensing device and gas generating engine therefor
US5540665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Jan 31, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC06D5/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a gas generating engine for driving a beneficial agent dispensing device. The engine comprising (a) a solid composition comprising an acidic compound or a basic compound, or a combination thereof, and (b) a means for maintaining substantially constant the surface area of the solid composition exposed to a reservoir fluid comprising water, or water and an acidic compound, or water and a basic compound, wherein in operation, the solid composition is exposed to the reservoir fluid which dissolves the solid composition and causes it to generate a gas, the gas being a driving fluid to dispense a beneficial agent. The present invention further provides a fluid driven dispensing device for delivering an agent into an environment of use, the device be driven by the gas generating engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.