US3867969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of dust during handling of materials
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-09-10
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Granted: 1975-02-25
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Expires: 1993-09-10
Abstract
Abstract Apparatus for controlling dust produced during gravity chuteloading of dusty solids into ships comprises a base plate having a central aperture engaging the chute, a flexible skirt extending downwardly from the plate to enclose loaded solids, variablelength bellows surrounding the chute and connected at the bottom to the plate and at the top to an air de-duster, and openings in the plate providing access for dust-laden air from the loaded solids into the bellows.
Inventors
- 👤 George William Garnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:44
CPC Classifications
B; B65; B65G; B65G69/00; B65G69/18; B65G69/185; B65G69/186
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
Apparatus for controlling dust clouds caused by the loading into containers of bulk solid material falling by gravity through a chute, cOmprising a base plate, an aperture substantially centrally located in the base plate and adapted to engage the lower end of the chute, a flared skirt depending from the base plate and adapted to cover the heap of material formed as the material falls from the chute, a tubular cover secured by its lower end to the base plate and which completely surrounds the aperture and encloses the chute with an annular space between the chute and the tubular cover, and a plurality of openings in the base plate, between the aperture and the tubular cover, providing access for air and dust from below the base plate into the annular space.
Claim 2
Dependent Claim
132 words
Apparatus for controlling dust clouds caused by the loading into containers of bulk solid material falling by gravity through a chute, cOmprising a base plate, an aperture substantially centrally located in the base plate and adapted to engage the lower end of the chute, a flared skirt depending from the base plate and adapted to cover the heap of material formed as the material falls from the chute, a tubular cover secured by its lower end to the base plate and which completely surrounds the aperture and encloses the chute with an annular space between the chute and the tubular cover, and a plurality of openings in the base plate, between the aperture and the tubular cover, providing access for air and dust from below the base plate into the annular space.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in claim 1, wherein said aperture comprises an upstanding hollow pipe adapted to engage the lower end of the chute.
Claim 4
Dependent Claim
27 words
Apparatus as claimed in claim 1, wherein the tubular cover comprises a variable-length bellows adapted to be extended or compressed depending upon the length of the chute.
Claim 5
Dependent Claim
60 words
Apparatus as claimed in claim 1, wherein said flared skirt comprises an outer row of downwardly-extending individual strips of a flexible material, each secured at its top end to the edge of the base plate, and a similar inner row of similar strips laterally staggered with respect to, and at least partially covered by, the strips of the outer row.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in claim 4, including at least one further similar row of similar strips, behind the inner row, laterally staggered with respect to the strips of the inner row.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 1, wherein said flared skirt comprises a plurality of downwardly extending strips of a flexible material, each secured at its top end to the edge of the base plate and each laterally overlapping an adjacent strip.
Claim 8
Dependent Claim
20 words
Apparatus as claimed in claim 1, including means for removing air and dust from the top of the annular space.
Claim 9
Dependent Claim
20 words
Apparatus as claimed in claim 1, including means for connecting the top of the annular space to a de-dusting system.
References Cited (Backward Citations)
US3118474A
Cited
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 |