Filtration apparatus
US6045540A · kind A · utility
Inventor
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/96
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Filtration apparatus suitable for use as a bladder evacuator includes a hinged, perforate flap 4 that is resiliently biased to extend across an opening 8 through the neck 7 of a squeezable bottle 1 for filtering out solids from liquid discharged when the bottle 1 is squeezed. Return of the liquid when the bottle 1 is released deflects the perforate flap 4 away from the opening 8 against the bias to allow solids to enter the bottle 1 with the returning liquid. A hinged imperforate flap 5 overlies the perforate flap 4 to be deflected with it by the returning liquid, but separates from it across the opening 8 when the bottle 1 is squeezed. The two flaps 4,5 are part of a folded sheet that is clamped onto a rim 6 of the bottle-neck 7 under a shoulder 12 of the bottle-cap 2; the shoulder 12 holds the perforate flap 4 against deflection away from the opening 8 when the bottle 1 is squeezed. As an alternative to a bottle, a squeeze-bulb 20 coupled to a cylinder 21 may be used with a single, perforate flap 24.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.