Pressure differential filtering apparatus
Abstract
Abstract A PRESSURE DIFFERENTIAL FILTERING APPARATUS WHICH INCLUDES AN ELONGATED SAMPLING TUBE, OPEN AT BOTH ENDS, ONE END HAVING A RESILIENT LIP FORMING A PISTON. A FILTER IS MOUNTED WITHIN A LONGITUDINAL PASSAGEWAY WITHIN THE PISTON. THE LOWER SURFACE OF THE LIP IS CAPABLE OF FORMING A SEAL WITH THE INTERIOR WALLS OF A CONTAINER HOLDING THE LIQUID TO BE FILTERED AND THE UPPER SURFACE IS PROVIDED WITH A PLURALITY OF RAISED PORTIONS, SUCH AS SERRATIONS, CORRUGATIONS, OR NODULES, SO THAT THE UPPER SURFACE IS INCAPABLE OF FORMING A SEAL WITH THE INTERIOR WALLS OF THE CONTAINER. THIS ARRANGEMENT ALLOWS THE PASSAGE OF AIR AROUND THE RESILIENT LIP UPON WITHDRAWAL FROM THE CONTAINER SO THAT THE SAMPLE COLLECTED IN THE TUBE IS NOT SUCKED BACK INTO THE CONTAINER THROUGH THE FILTER.
Inventors
- 👤 I Haldopoulos
Bibliographic Details
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