Patent US3887343A successfully refreshed from Google Patents.
US3887343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pocket or bag filter with dust recirculation
Assignee: Individual
•
Filing: 1973-03-22
•
Granted: 1975-06-03
•
Expires: 1993-03-22
Abstract
Abstract A filter housing, divided into a purification chamber with a row of parallel filter sections and an adjoining exit manifold communicating with these filter sections, forms a dustcollecting trough extending beneath the row of filter sections and an upright return air shaft communicating at its lower end with that trough, this air shaft entering an inlet duct through which incoming dust-laden gas is supplied to the filter sections. A screw conveyor in the dust-collecting trough has two portions for delivering predetermined fractions of the accumulating dust to a discharge duct at one end of the trough and to the return air shaft at its opposite end; the latter fraction is driven by compressed air from a blower through that shaft into the inlet duct to agglomerate with the arriving fine dust, thereby preventing clogging of the filter surfaces by small particles.
Inventors
- 👤 Adolf Margraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/42; B01D46/48; Y; Y10; Y10S; Y10S55/00; Y10S55/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A filtering apparatus comprising: a housing provided with partition means dividing same into a purification chamber and an exit manifold, said purification chamber being subdivided into a multiplicity of parallel filter sections communicating with said exit manifold, said housing further forming a dust-collecting trough extending underneath said filter sections and communicating therewith; a supply duct for incoming dust-laden gas to be purified, said supply duct opening onto said filter sections for delivering a continuous flow of said gas to filtering surfaces thereof adapted to retain accompanying solids; extractor means in said trough for removing dust particles descending from said filter sections, said extractor means including a first and a second conveyor element for transporting predetermined fractions of accumulating dust to opposite ends of said trough, said housing being provided with a channel communicating with said supply duct and with one of the ends of said trough; blower means communicating with said channel for driving one of said fractions of accumulated dust back into said supply duct; and discharge means at the other end of said trough for removing the other of said fractions from said housing.
Claim 2
Dependent Claim
186 words
A filtering apparatus comprising: a housing provided with partition means dividing same into a purification chamber and an exit manifold, said purification chamber being subdivided into a multiplicity of parallel filter sections communicating with said exit manifold, said housing further forming a dust-collecting trough extending underneath said filter sections and communicating therewith; a supply duct for incoming dust-laden gas to be purified, said supply duct opening onto said filter sections for delivering a continuous flow of said gas to filtering surfaces thereof adapted to retain accompanying solids; extractor means in said trough for removing dust particles descending from said filter sections, said extractor means including a first and a second conveyor element for transporting predetermined fractions of accumulating dust to opposite ends of said trough, said housing being provided with a channel communicating with said supply duct and with one of the ends of said trough; blower means communicating with said channel for driving one of said fractions of accumulated dust back into said supply duct; and discharge means at the other end of said trough for removing the other of said fractions from said housing.
Claim 3
Dependent Claim
186 words
A filtering apparatus comprising: a housing provided with partition means dividing same into a purification chamber and an exit manifold, said purification chamber being subdivided into a multiplicity of parallel filter sections communicating with said exit manifold, said housing further forming a dust-collecting trough extending underneath said filter sections and communicating therewith; a supply duct for incoming dust-laden gas to be purified, said supply duct opening onto said filter sections for delivering a continuous flow of said gas to filtering surfaces thereof adapted to retain accompanying solids; extractor means in said trough for removing dust particles descending from said filter sections, said extractor means including a first and a second conveyor element for transporting predetermined fractions of accumulating dust to opposite ends of said trough, said housing being provided with a channel communicating with said supply duct and with one of the ends of said trough; blower means communicating with said channel for driving one of said fractions of accumulated dust back into said supply duct; and discharge means at the other end of said trough for removing the other of said fractions from said housing.
Claim 4
Dependent Claim
186 words
A filtering apparatus comprising: a housing provided with partition means dividing same into a purification chamber and an exit manifold, said purification chamber being subdivided into a multiplicity of parallel filter sections communicating with said exit manifold, said housing further forming a dust-collecting trough extending underneath said filter sections and communicating therewith; a supply duct for incoming dust-laden gas to be purified, said supply duct opening onto said filter sections for delivering a continuous flow of said gas to filtering surfaces thereof adapted to retain accompanying solids; extractor means in said trough for removing dust particles descending from said filter sections, said extractor means including a first and a second conveyor element for transporting predetermined fractions of accumulating dust to opposite ends of said trough, said housing being provided with a channel communicating with said supply duct and with one of the ends of said trough; blower means communicating with said channel for driving one of said fractions of accumulated dust back into said supply duct; and discharge means at the other end of said trough for removing the other of said fractions from said housing.
Claim 5
Dependent Claim
32 words
A filtering apparatus as defined in claim 1 wherein said supply duct extends above said filter sections, said channel being an upright air shaft rising from said trough to said supply duct.
Claim 6
Dependent Claim
27 words
A filtering apparatus as defined in claim 1 wherein said blower means is provided with a gooseneck connection leading to the lower end of said air shaft.
Claim 7
Dependent Claim
18 words
A filtering apparatus as defined in claim 1 wherein said first and second conveyor elements are screw conveyors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |