Centrifugal force-enhanced filtration of fluids
AssigneeW. R. Grace & Co.
InventorsWilliam F. Bowers, Douglas B. Tiffany
Life of this patent
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Abstract
A filtration apparatus and method is disclosed, the apparatus including a container tube for holding a sample to be filtered and a filtering vessel inserted therein. The filtering vessel carries a filter over its lower end and includes a chamber portion for receiving the filtrate. The method includes forcibly immersing the filtration vessel into the container tube, limiting the relative axial position therebetween, and subjecting the apparatus to centrifugation. The apparatus and method is useful for filtering dilute, concentrated and particle-laden samples.
Claims27
A method of filtering a composition comprising:
- placing a composition to be filtered into a container means;
- forcibly immersing a filtering vessel means for receiving filtrate into said composition in said container means, said filtering vessel means including an end having a filter means therein;
- limiting the axial position of the filtering vessel means relative to the container means by placing a means into engagement between the filtering vessel means and the container means to provide limited movement there maintaining said filtering vessel means forcibly immersed;
- and
- subjecting said container means, filtering vessel means and composit9ion to centrifugal force and thereby effecting filtration.
A filtration apparatus, comprising:
- a container means for containing a sample to be filtered and comprising an elongate tube having an upper open end and a lower closed end;
- a filtering vessel means for receiving filtrate and comprising an elongate tube adapted to be inserted into said container means, said filtering vessel means having an upper open end and a lower end covered by a filter means;
- and
- cap means for sealing said sample in said apparatus, said cap means comprising means for engagement between said filtering vessel means and said container means limiting the axial position of said filtering vessel means relative to said container means.
A method of filtering a composition comprising:
- placing a composition to be filtered into a container means;
- forcibly immersing a filtering vessel means for receiving filtrate into said composition in said container means, said filtering vessel means including an end having a filter means therein;
- limiting the axial position of the filtering vessel means relative to the container means by placing a means into engagement between the filtering vessel means and the container means to prevent free from the filtering vessel means;
- and
- subjecting said container means, filtering vessel means and composition to centrifugal force and thereby effecting filtration.
A method of filtering a composition comprising, in the following sequence;
- placing a composition to be filtered into a container means;
- forcibly immersing a filtering vessel means for receiving filtrate into said composition in said container means, said filtering vessel means including an end having a filter means therein;
- limiting the axial position of the filtering vessel means relative to the container means by placing a means into engagement between the filtering vessel means and the container means to maintain said vessel means forcibly immersed;
- and
- subjecting said container means, filtering vessel means and composition to centrifugal force and thereby effecting filtration.
Dependencies are inferred from the claim text.