US3868237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust filter
Assignee: Individual
•
Filing: 1973-04-30
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Granted: 1975-02-25
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Expires: 1993-04-30
Abstract
Abstract A filter for removing particulate contaminants from a gas has a filter chamber divided into two compartments by a horizontal bed of sand or the like. The contaminated gas flows downward through the filter bed for its purification, and a purging gas backwashes the bed from time to time for regenerating the same. Independent valves control the two gas streams in such a manner that flow of the contaminated gas stream is throttled while the permeability of the filter bed is low immediately after regeneration while flow of the purging gas may be started suddenly for shaking the filter bed.
Inventors
- 👤 Wolfgang Berz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:45
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
391 words
In a filter arrangement for purifying a gas of particulate solid material with which said gas is contaminated, said arrangement including a filter chamber, first inlet means for admitting contaminated gas to Said chamber, first outlet means for releasing purified gas from said chamber, second inlet means for admitting a purging gas to said chamber and second outlet means for discharging said purging gas from said chamber, a layer of particulate filter medium in said chamber, said first inlet means and said first outlet means defining a first path of gas flow through said chamber, said first path passing through said layer in one direction from said first inlet means to said first outlet means, said second inlet means and said second outlet means defining a second path of gas flow through said chamber, said second path extending from said second inlet means toward said second outlet means and passing through said layer in a direction opposite to said one direction, first valve means in said first path movable between a path opening and a path blocking position, second valve means in said second path movable between a path opening and a path blocking position, the improvement which comprises: a. first and second valve operating means respectively associated with said first and second valve means for moving the associated valve means between said positions thereof; and b. valve control means operatively connected to said valve operating means for causing operation of said valve means in cycles of sequential stages, each cycle including 1. a first stage wherein said first valve means is in the path opening position and said second valve means is in the path blocking position, 2. a second stage wherein said first valve means is being moved to the path blocking position while said second valve means remains in the path blocking position, 3. a third stage wherein said second valve means is being moved to the path opening position while said first valve means remains in the path blocking position, 4. a fourth stage wherein said second valve means is being moved to the path blocking position while said first valve means remains near the path blocking position, and 5, a fifth stage wherein said first valve means is being moved into the path opening position while said second valve means remains in the path blocking position.
Claim 2
Dependent Claim
391 words
In a filter arrangement for purifying a gas of particulate solid material with which said gas is contaminated, said arrangement including a filter chamber, first inlet means for admitting contaminated gas to Said chamber, first outlet means for releasing purified gas from said chamber, second inlet means for admitting a purging gas to said chamber and second outlet means for discharging said purging gas from said chamber, a layer of particulate filter medium in said chamber, said first inlet means and said first outlet means defining a first path of gas flow through said chamber, said first path passing through said layer in one direction from said first inlet means to said first outlet means, said second inlet means and said second outlet means defining a second path of gas flow through said chamber, said second path extending from said second inlet means toward said second outlet means and passing through said layer in a direction opposite to said one direction, first valve means in said first path movable between a path opening and a path blocking position, second valve means in said second path movable between a path opening and a path blocking position, the improvement which comprises: a. first and second valve operating means respectively associated with said first and second valve means for moving the associated valve means between said positions thereof; and b. valve control means operatively connected to said valve operating means for causing operation of said valve means in cycles of sequential stages, each cycle including 1. a first stage wherein said first valve means is in the path opening position and said second valve means is in the path blocking position, 2. a second stage wherein said first valve means is being moved to the path blocking position while said second valve means remains in the path blocking position, 3. a third stage wherein said second valve means is being moved to the path opening position while said first valve means remains in the path blocking position, 4. a fourth stage wherein said second valve means is being moved to the path blocking position while said first valve means remains near the path blocking position, and 5, a fifth stage wherein said first valve means is being moved into the path opening position while said second valve means remains in the path blocking position.
Claim 3
Dependent Claim
27 words
a second stage wherein said first valve means is being moved to the path blocking position while said second valve means remains in the path blocking position,
Claim 4
Dependent Claim
27 words
a second stage wherein said first valve means is being moved to the path blocking position while said second valve means remains in the path blocking position,
Claim 5
Dependent Claim
59 words
In an arrangement as set forth in claim 1, said valve control means including means for causing movement of said first valve means in said fifth stage into said path opening position thereof at a speed smaller than the speed of movement of said second valve means to the path opening position of the same in said third stage.
Claim 6
Dependent Claim
59 words
In an arrangement as set forth in claim 2, sensing means for sensing a differential of gas pressures in one of said paths across said layer, said valve control means being operatively connected to said sensing means for controlling operation of said first valve means in said fifth stage in response to a sensed pressure differential of predetermined magnitude.
Claim 7
Dependent Claim
27 words
a third stage wherein said second valve means is being moved to the path opening position while said first valve means remains in the path blocking position,
Claim 8
Dependent Claim
27 words
a third stage wherein said second valve means is being moved to the path opening position while said first valve means remains in the path blocking position,
Claim 9
Dependent Claim
56 words
a fourth stage wherein said second valve means is being moved to the path blocking position while said first valve means remains near the path blocking position, and 5, a fifth stage wherein said first valve means is being moved into the path opening position while said second valve means remains in the path blocking position.
Claim 10
Dependent Claim
56 words
a fourth stage wherein said second valve means is being moved to the path blocking position while said first valve means remains near the path blocking position, and 5, a fifth stage wherein said first valve means is being moved into the path opening position while said second valve means remains in the path blocking position.
Claim 11
Dependent Claim
54 words
In an arrangement as set forth in claim 2, sensing means for sensing the concentration of said particles in said purified gas, said valve control means being operatively connected to said sensing means for controlling operation of said first valve means in said fifth stage in response to a second concentration of predetermined magnitude.
Claim 12
Dependent Claim
72 words
In an arrangement as set forth in claim 2, said first valve means including a first valve member and a first valve seat in said first outlet means, said second valve means including a second valve member and a second valve seat in said second inlet means, and said valve operating means including means for moving said valve members relative to said valve seats between respective path opening and path blocking positions.
Claim 13
Dependent Claim
72 words
In an arrangement as set forth in claim 2, said first valve means including a first valve member and a first valve seat in said first inlet means, said second valve means including a second valve member and a second valve seat in said second outlet means, and said valve operating means including means for moving said valve members relative to said valvE seats between respective path opening and path blocking positions.
Claim 14
Dependent Claim
31 words
In an arrangement as set forth in claim 2, a single pipe leading into said chamber and consituting a common portion of said first inlet means and said second outlet means.
Claim 15
Dependent Claim
109 words
In an arrangment as set forth in claim 2, one of said valve means including a valve member and a valve seat, said valve operating means including means for moving said valve member relative to said valve seat between a path opening and a path blocking position for flow of gas through said valve seat in a predetermined direction when said valve member is in the path opening position, said valve operating means moving said valve member between said positions thereof in a direction transverse to said predetermined direction and in wiping engagement with said valve seat, said valve seat extending in a plane parallel to said transverse direction.
Claim 16
Dependent Claim
20 words
In an arrangement as set forth in claim 8, said transverse direction being obliquely inclined relative to said predetermined direction.
Claim 17
Dependent Claim
17 words
In an arrangement as set forth in claim 8, said valve member being mounted in said chamber.
Claim 18
Dependent Claim
33 words
In an arrangement as set forth in claim 8, said one valve means further including yieldably resilient means biasing said valve member toward said wiping engagement during said moving of the valve member.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |