Liquid delivery device
US5398851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Aug 6, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/027
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A liquid dispensing device and the method of dispensing liquid are disclosed. The device is uniquely suited to meet the requirements of hospitals and other institutions for long shelf life in inert condition and ready activation when needed. The device includes a hollow gas- and liquid-tight casing (preferably spherical or cylindrical), a flexible gas- and liquid-tight membrane disposed entirely across the casing interior dividing the interior into a propellant chamber and a liquid chamber; an outlet port from the liquid chamber; two mutually reactive chemicals in the propellant chamber but separated by a barrier; and a member to breach the barrier and permit the chemicals to come into contact; the two chemicals being reactive upon contact to form a propellant gas. The propellant gas thereupon expands against the membrane, moves the membrane to enlarge the propellant chamber, decrease the liquid chamber, and expel the contained liquid from the liquid chamber through the outlet port. The barrier may be breached in any convenient manner, as by breaking a frangible barrier or perforating a perforable one. Preferably at least one of the chemicals is in liquid form, and one is a Group I…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.