US4645596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus
Assignee: Nihon Schumacher KK
•
Filing: 1985-08-26
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Granted: 1987-02-24
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Expires: 2005-08-26
Abstract
Abstract The filter apparatus has a plurality of filter cylinders each formed of a plurality of filter elements and a blind cylinder is provided between a support plate for supporting the filter cylinders and the uppermost filter element of each filter cylinder, in order to prevent a liquid to be filtered from passing a region of each filter cylinder where the surface of the liquid is moved vertically.
Inventors
- 👤 Soichi Kuwajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/50; B01D29/52; B01D29/54; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/28; B01D2201/287; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
212 words
A filter apparatus for filtering liquids, comprising: a filter tank; a plurality of filter cylinders supported vertically by a support plate for partitioning the filter tank into two spaces, in one said space a liquid to be filtered is fed and through the other said space a filtrate is discharged outwardly, each filter cylinder having a plurality of porous filter elements around which diatomaceous earth is drifted for filtering the liquids below the support plate; a spindle inserted into each filter cylinder for supporting the filter cylinder on the support plate, said spindle having a flange at its lower end for supporting the lowermost filter element; a support member with at least one opening for permitting filtrate to pass therethrough and disposed so as to cover a hole formed in the support plate, the upper end of the spindle passing through the hole being supported by the support member; and blind means having a predetermined length longer than a distance through which the surface of the liquid is moved vertically during a normal filter operation disposed under the support plate on each filter cylinder, so that the liquid to be filtered is prevented from passing through an upper region of the filter cylinder close to the support plate of the filter cylinder.
Claim 2
Dependent Claim
212 words
A filter apparatus for filtering liquids, comprising: a filter tank; a plurality of filter cylinders supported vertically by a support plate for partitioning the filter tank into two spaces, in one said space a liquid to be filtered is fed and through the other said space a filtrate is discharged outwardly, each filter cylinder having a plurality of porous filter elements around which diatomaceous earth is drifted for filtering the liquids below the support plate; a spindle inserted into each filter cylinder for supporting the filter cylinder on the support plate, said spindle having a flange at its lower end for supporting the lowermost filter element; a support member with at least one opening for permitting filtrate to pass therethrough and disposed so as to cover a hole formed in the support plate, the upper end of the spindle passing through the hole being supported by the support member; and blind means having a predetermined length longer than a distance through which the surface of the liquid is moved vertically during a normal filter operation disposed under the support plate on each filter cylinder, so that the liquid to be filtered is prevented from passing through an upper region of the filter cylinder close to the support plate of the filter cylinder.
Claim 3
Dependent Claim
15 words
A filter apparatus according to claim 1, wherein each filter element is made of ceramic.
Claim 4
Dependent Claim
17 words
A filter apparatus according to claim 1, wherein the blind means is formed of a non-porous cylinder.
Claim 5
Dependent Claim
23 words
A filter apparatus according to claim 1, wherein said blind means comprises a blind cylinder covering the upper part of the filter cylinders.
Claim 6
Dependent Claim
228 words
A filter apparatus for filtering liquid, comprising: a filter tank; a plurality of filter cylinders supported vertically by a support plate for partitioning the filter tank into two spaces, in one said space a liquid to be filtered is fed and through the other said space a filtrate is discharged outwardly, each filter cylinder having a plurality of porous filter elements around which diatomaceous earth is drifted for filtering the liquid below a support plate, said filter elements being made of a ceramic material; a spindle inserted into each filter cylinder for supporting the filter cylinder on the support plate, said spindle having a flange at its lower end for supporting the lowermost filter elements; a support member with at least one opening for permitting filtrate to pass therethrough and disposed so as to cover a hole formed in the support plate, the upper end of the spindle passing through the hole being supported by the support member; and blind means being formed of a non-porous cylinder and having a predetermined length longer than a distance through which the surface of the liquid is moved vertically during a normal filter operation disposed under the support plate on each filter cylinder, so that the liquid to be filtered is prevented from passing through an upper region of the filter cylinder close to the support plate of the filter cylinder.
Claim 7
Dependent Claim
228 words
A filter apparatus for filtering liquid, comprising: a filter tank; a plurality of filter cylinders supported vertically by a support plate for partitioning the filter tank into two spaces, in one said space a liquid to be filtered is fed and through the other said space a filtrate is discharged outwardly, each filter cylinder having a plurality of porous filter elements around which diatomaceous earth is drifted for filtering the liquid below a support plate, said filter elements being made of a ceramic material; a spindle inserted into each filter cylinder for supporting the filter cylinder on the support plate, said spindle having a flange at its lower end for supporting the lowermost filter elements; a support member with at least one opening for permitting filtrate to pass therethrough and disposed so as to cover a hole formed in the support plate, the upper end of the spindle passing through the hole being supported by the support member; and blind means being formed of a non-porous cylinder and having a predetermined length longer than a distance through which the surface of the liquid is moved vertically during a normal filter operation disposed under the support plate on each filter cylinder, so that the liquid to be filtered is prevented from passing through an upper region of the filter cylinder close to the support plate of the filter cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |