Patent US5922208A successfully refreshed from Google Patents.
US5922208A
Expired / Lapsed
US
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Filter device
Assignee: Defil Holland Intertrust Antilles NV
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Filing: 1996-06-10
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Granted: 1999-07-13
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Expires: 2016-06-10
Abstract
Abstract A method for filtering out of a liquid at least one solid substance includes supplying the liquid containing the substance via axial supply to a filter; filtering the liquid wherein the substance remains in the filter as residue; draining away the liquid; compressing a predetermined amount of residue to the shape of a solid bar under the pressure of the liquid during filtering; opening closeable discharge axially opposite the supply end during filtering; and removing the bar out of the filter under the pressure exerted by the liquid on the bar.
Inventors
- 👤 Petrus Adrianus Cornelis Maria Demmers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:40
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/60; B01D29/606; B01D29/62; B01D29/64; B01D29/6438; B01D29/70; B01D29/72; B01D29/88; B01D29/90; B01D29/904; B01D29/94
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A method for filtering out of a liquid at least one solid substance, said method comprising consecutively: supplying said liquid containing said substance via axial supply means to tube-shaped filter means; filtering said liquid containing said substance wherein said substance remains in said filter means as residue; draining away said liquid; compressing a predetermined amount of residue to the shape of a solid bar under the pressure of said liquid during filtering; opening closeable discharge means axially opposite said supply means during said filtering; and removing said bar out of said filter means under the pressure exerted by said liquid on said bar.
Claim 2
Independent Claim
103 words
A method for filtering out of a liquid at least one solid substance, said method comprising consecutively: supplying said liquid containing said substance via axial supply means to tube-shaped filter means; filtering said liquid containing said substance wherein said substance remains in said filter means as residue; draining away said liquid; compressing a predetermined amount of residue to the shape of a solid bar under the pressure of said liquid during filtering; opening closeable discharge means axially opposite said supply means during said filtering; and removing said bar out of said filter means under the pressure exerted by said liquid on said bar.
Claim 3
Dependent Claim
34 words
A method according to claim 1, further comprising measuring said pressure exerted by said liquid on said bar during filtering, and opening said discharge means when a predetermined value of said pressure is attained.
Claim 4
Dependent Claim
21 words
A method according to claim 1, further comprising closing said discharge means after said bar has passed by said discharge means.
Claim 5
Dependent Claim
26 words
A method according to claim 3, further comprising: observing said bar passing by said discharge means; and closing said discharge means in response to said observing.
Claim 6
Dependent Claim
23 words
A method according to claim 3, further comprising closing said discharge means after a predetermined period of time required for removing said bar.
Claim 7
Dependent Claim
26 words
A method according to claim 5, further comprising observing when said bar starts to move for closing said discharge means after said predetermined period of time.
Claim 8
Dependent Claim
48 words
A method according claim 1, further comprising pounding or shaking said filter means, if said pressure in said filter means is inadequate or if a time span between opening of said discharge means and the moment in time, when said bar starts to move, exceeds a predetermined value.
Claim 9
Dependent Claim
43 words
A method according to claim 1, further comprising setting a length of said bar to be formed in said filter means by covering passages for said fluid in said filter means along at least a part of the length of said filter means.
Claim 10
Dependent Claim
123 words
A device for carrying out a method according to claim 7, said device comprising: mainly tube-shaped filter means with housing means for collecting said filtered liquid; supply means connected to a first axial end of said filter means for supplying said liquid containing said substance; drain means connected to said housing means for collecting said filtered liquid; and closeable discharge means connected to a second axial end of said filter means opposite to said supply means for removing residue filtered from said fluid containing said substance, wherein said filter means comprises a pound or shake mechanism for release of a bar of residue in an opened state of said closeable discharge means, said bar having been formed in said filter means while filtering.
Claim 11
Dependent Claim
112 words
A device for carrying out the method according to claim 8, said device comprising: mainly tube-shaped filter means with housing means for collecting said filtered fluid; supply means connected to a first axial end of said filter means for supplying said fluid containing said substance; drain means connected to said housing means for collecting said filtered fluid; and closeable discharge means connected to a second axial end of said filter means for removing filtered and compressed residue in the shape of a bar from said filter means; and wherein said filter means comprises covering means in close contact with said filter means and movable in the axial direction of said filter means.
Claim 12
Dependent Claim
129 words
A device for carrying out the method of claim 3, said device comprising: mainly tube-shaped filter means with a housing for guiding said filtered fluid; supply means connected to a first axial end of said filter means for supplying said fluid containing said sasubstance; drain means connected to said housing means for collecting said filtered fluid; closeable discharge means connected to a second axial end of said filter means for removing filtered and compressed residue in the shape of a bar from said filter means; and control means for controlling opening and closing of said discharge means, wherein said control means comprises calculating means for determining at least one of the period of time for opening said discharge means, and the moment in time for closing said discharge means.
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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) | 2002-07-12 | 2003-01-11 | 2003-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-12 | 2007-01-11 | 2007-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-12 | 2011-01-11 | 2011-07-13 | $7700.00 | Window Closed / Lapsed |