US4277337A — Deposit filtering apparatus for filtering turbid …

Claim 1

Independent Claim 326 words

A deposit filtering apparatus for filtering turbid liquids, said apparatus comprising: an essentially cylindrical, vertical filter container which includes turbid-liquid chambers and a filtrate chamber; a first conduit for supplying turbid liquid to said turbid-liquid chambers; a second conduit for discharge of filtered liquid from said filtrate chamber; a packet of vertically arranged sieve-like, plate-shaped filter elements arranged as a removable unit in said filter container between said turbid-liquid chambers and said filtrate chamber, with said filtrate chamber surrounding the sides of said packet, said packet being closed on its four vertical sides and being tightly connected with said filter container on its upper and lower edges by means of an intermediate cover and intermediate bottom respectively, so that between said cover and bottom said filtrate chamber is separated from said turbid-liquid chambers, said filter elements being plane parallel to, and spaced from, one another to form said turbid-liquid chambers, said last mentioned chambers being open toward the top and bottom, and being tightly closed relative to said filtrate chamber by vertical spacer strips located between the vertical edges of said filter elements, with the upper and lower horizontal faces of said filter elements being tightly closed, while the vertical faces thereof are opened to said filtrate chamber between said spacer strips, that side of said filter elements facing the pertaining turbid-liquid chamber being provided with a detachable filter membrane covering formed by deposit on said element of a suspension agent which aids filtering, said filter container having a substantially flat bottom below said filter element packet, said bottom being provided with a closable quadratic opening to allow removal of filter cakes which comprise filter aiding agent and impurities and which were built up and separated from said filter elements, the cross section of said quadratic bottom opening corresponding to the entire horizontal cross section of said filter element packet; and a bottom flap connected to said filter container for tightly closing said quadratic bottom opening.

Claim 2

Dependent Claim 326 words

A deposit filtering apparatus for filtering turbid liquids, said apparatus comprising: an essentially cylindrical, vertical filter container which includes turbid-liquid chambers and a filtrate chamber; a first conduit for supplying turbid liquid to said turbid-liquid chambers; a second conduit for discharge of filtered liquid from said filtrate chamber; a packet of vertically arranged sieve-like, plate-shaped filter elements arranged as a removable unit in said filter container between said turbid-liquid chambers and said filtrate chamber, with said filtrate chamber surrounding the sides of said packet, said packet being closed on its four vertical sides and being tightly connected with said filter container on its upper and lower edges by means of an intermediate cover and intermediate bottom respectively, so that between said cover and bottom said filtrate chamber is separated from said turbid-liquid chambers, said filter elements being plane parallel to, and spaced from, one another to form said turbid-liquid chambers, said last mentioned chambers being open toward the top and bottom, and being tightly closed relative to said filtrate chamber by vertical spacer strips located between the vertical edges of said filter elements, with the upper and lower horizontal faces of said filter elements being tightly closed, while the vertical faces thereof are opened to said filtrate chamber between said spacer strips, that side of said filter elements facing the pertaining turbid-liquid chamber being provided with a detachable filter membrane covering formed by deposit on said element of a suspension agent which aids filtering, said filter container having a substantially flat bottom below said filter element packet, said bottom being provided with a closable quadratic opening to allow removal of filter cakes which comprise filter aiding agent and impurities and which were built up and separated from said filter elements, the cross section of said quadratic bottom opening corresponding to the entire horizontal cross section of said filter element packet; and a bottom flap connected to said filter container for tightly closing said quadratic bottom opening.

Claim 3

Dependent Claim 39 words

An apparatus according to claim 1, in which said filter membrane covering on said filter elements comprises a thin blocking layer, of fiber material, deposited prior to said turbid-liquid filtering, and a kieselguhr layer deposited during said turbid-liquid filtering.

Claim 4

Dependent Claim 33 words

An apparatus according to claim 1, in which said filter elements respectively contain a closed plate located approximately in the middle of the layer thickness thereof and extending to the vertical faces thereof.

Claim 5

Dependent Claim 48 words

An apparatus according to claim 3, in which said filter elements include fabric, the fabric layers arranged on both sides of said plate being subdivided by a plurality of horizontal separating strips into a plurality of partial fields which are open on the faces of said filter elements.

Claim 6

Dependent Claim 18 words

An apparatus according to claim 4, in which said filter elements also include a central vertical separating strip.

Claim 7

Dependent Claim 103 words

An apparatus according to claim 1, in which said filter elements include fabric, and which includes a compressed-air supply container, and a third conduit connecting said filtrate chamber and said compressed-air supply container and capable of being closed, the air volume and pressure of said last mentioned container being such that during shock-like relieving of the compressed air into said filtrate chamber with an empty filter container and open bottom flap, an air pressure results in said filtrate chamber and said fabric layers of said filter elements which is sufficient to knock off filter cakes from said filter elements into said turbid-liquid chambers.

Claim 8

Dependent Claim 23 words

An apparatus according to claim 6, in which said resulting air pressure is in the approximate rate of from 0.1 to 0.2 bar.

Claim 9

Dependent Claim 69 words

An apparatus according to claim 6, in which the volume of said compressed-air supply container is approximately 10% of the volume of said filtrate chamber, the air pressure in said compressed-air supply container is approximately 10 bar prior to said relieving of said compressed air into said filtrate chamber, and said third conduit is provided with a valve embodied with an opening time of approximately 0.02 to 0.03 seconds.

Claim 10

Dependent Claim 60 words

An apparatus according to claim 1, which includes: a preparation container for a fiber suspension, said last mentioned container being connected to a paper supply roll and being provided with a stirring mechanism having knife-like sharp blades for tearing up a paper web introduced into said preparation container; and a fourth conduit connecting said turbid-liquid chambers with said preparation container.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-07-06	1985-01-05	1985-07-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-07-06	1989-01-05	1989-07-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-07-06	1993-01-05	1993-07-07	$7700.00	Window Closed / Lapsed

Deposit filtering apparatus for filtering turbid liquids

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