Patent US4238568B1 successfully refreshed from Google Patents.
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US3960001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag filter leak detection
Assignee: Cabot Corp
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Filing: 1974-06-03
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Granted: 1976-06-01
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Expires: 1994-06-03
Abstract
Abstract A method for the detection of leaks in bag filter apparatus is disclosed wherein there is employed a leak tracer composition comprising a gaseous dispersion of a very light, sub-micron particulate contrast medium. The tracer composition is flowed through the bag filter apparatus and leaks are detected by visual inspection of the filtration elements from the exhaust side thereof.
Inventors
- 👤 Jimmie R. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:49
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; Y; Y10; Y10S; Y10S55/00; Y10S55/45
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
In a method for detection of leaks in bag filter dust collector apparatus comprising visual inspection of the exhaust side of the bag filter dust collector, the improvement which comprises introducing a tracer composition into the collection side and flowing said composition through said bag filter dust collector during the course of said inspection and locating leak sites, said tracer composition comprising a gaseous dispersion of a finely-divided particulate solid tracer medium having an average ultimate particle diameter of less than about 100 millimicrons, an apparent density of less than about 10 lbs/ft 3 and a color which contrasts substantially with the color of the dust normally collected in said bag filter apparatus.
Claim 2
Dependent Claim
113 words
In a method for detection of leaks in bag filter dust collector apparatus comprising visual inspection of the exhaust side of the bag filter dust collector, the improvement which comprises introducing a tracer composition into the collection side and flowing said composition through said bag filter dust collector during the course of said inspection and locating leak sites, said tracer composition comprising a gaseous dispersion of a finely-divided particulate solid tracer medium having an average ultimate particle diameter of less than about 100 millimicrons, an apparent density of less than about 10 lbs/ft 3 and a color which contrasts substantially with the color of the dust normally collected in said bag filter apparatus.
Claim 3
Dependent Claim
40 words
The improvement of claim 1 wherein sid particulate tracer medium is silica having an average ultimate particle diameter of between about 10 and about 50 millimicrons and an apparent density of between about 2 and about 5 lbs/ft 3 .
Claim 4
Dependent Claim
13 words
The improvement of claim 2 wherein said particulate tracer medium is pyrogenic silica.
Claim 5
Dependent Claim
15 words
The improvement of claim 1 wherein the gaseous component of said tracer composition is air.
Claim 6
Dependent Claim
63 words
The improvement of claim 1 wherein said tracer composition is performed and introduced into the collection side of said bag filter by stationing pressure blower means adjacent and directed into an opening into the collection side of the bag filter, placing said blower means into operation and introducing said particulate tracer medium, in bulk form, into the suction of said operating blower means.
Claim 7
Dependent Claim
60 words
The improvement of claim 1 wherein the dust normally collected in said bag filter apparatus is carbon black and the particulate tracer medium employed in the tracer composition is white pyrogenic silica having an average ultimate particle diameter of between about 10 and about 50 millimicrons and an apparent density of between about 2 and about 5 lbs/ft 3 .
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |