Patent US3908720A successfully refreshed from Google Patents.
US3908720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of dust during discharge of materials into hoppers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-10-19
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Granted: 1975-09-30
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Expires: 1993-10-19
Abstract
Abstract A hopper for dusty materials includes, near the top thereof, surrounded by dust-settling chamber(s) and apertures above and below the grid allowing dust to pass from the grid into the chamber (s), the chamber(s) being provided with dust-extracting vent(s) adapted to be connected to dust-extracting means.
Inventors
- 👤 George William Garnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:50
CPC Classifications
B; B65; B65G; B65G69/00; B65G69/18; B65G69/185; B65G69/186
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
Dust-control apparatus for a hopper, the said apparatus being located adjacent the top of the hopper and comprising a substantially horizintal grid, at least one dust-settling chamber surrounding the grid, a plurality of apertures located above the grid and permitting access of dust from above the grid into the upper part of the chamber, a plurality of apertures located below the grid and permitting access of dust from below the grid into the lower part of the chamber, at least one dust-extracting vent in the wall of the chamber and means for connecting the vent to dust-extracting ducting.
Claim 2
Dependent Claim
98 words
Dust-control apparatus for a hopper, the said apparatus being located adjacent the top of the hopper and comprising a substantially horizintal grid, at least one dust-settling chamber surrounding the grid, a plurality of apertures located above the grid and permitting access of dust from above the grid into the upper part of the chamber, a plurality of apertures located below the grid and permitting access of dust from below the grid into the lower part of the chamber, at least one dust-extracting vent in the wall of the chamber and means for connecting the vent to dust-extracting ducting.
Claim 3
Dependent Claim
25 words
Apparatus as claimed in claim 1, wherein the dust-settling chamber is of substantially triangular cross-section and the grid is secured thereto by an edge thereof.
Claim 4
Dependent Claim
36 words
Apparatus as claimed in claim 2, wherein the dust-extracting vent is located substantially at the apex of the triangular chamber and is in the form of a slot adapted to be connected to the dust-extracting ducting.
Claim 5
Dependent Claim
103 words
In combination, a hopper having a top and dust-control apparatus located adjacent the top of said hopper and communicating therewith, said apparatus comprising a substantially horizontal grid, at least one dust-settling chamber surrounding the grid, a plurality of apertures located above the grid and permitting access of dust from above the grid into the upper part of the chamber, a plurality of apertures located below the grid and permitting access of dust from below the grid into the lower part of the chamber, at least one dust-extracting vent in the wall of the chamber and means for connecting the vent to dust-extracting ducting.
Claim 6
Dependent Claim
103 words
In combination, a hopper having a top and dust-control apparatus located adjacent the top of said hopper and communicating therewith, said apparatus comprising a substantially horizontal grid, at least one dust-settling chamber surrounding the grid, a plurality of apertures located above the grid and permitting access of dust from above the grid into the upper part of the chamber, a plurality of apertures located below the grid and permitting access of dust from below the grid into the lower part of the chamber, at least one dust-extracting vent in the wall of the chamber and means for connecting the vent to dust-extracting ducting.
Claim 7
Dependent Claim
54 words
The combination claimed in claim 4, said hopper being surmounted by a hood with the dust-control apparatus located between the hood and the hopper, the top and side of the hood being provided with an opening only sufficiently large to allow a load of material to be inserted into and discharged within the hood.
Claim 8
Dependent Claim
25 words
In combination, a hopper having a top and dustcontrol apparatus as claimed in claim 1 located adjacent the top of said hopper and communicating therewith.
Claim 9
Dependent Claim
28 words
The combination claimed in claim 5, wherein the closed side of the hood is provided with at least one dust-extracting vent adapted to be connected to dustextracting means.
Claim 10
Dependent Claim
27 words
The combination claimed in claim 7, wherein the dust-extracting vent is in the form of a slot adapted to be connected by ducting to the dust-extracting means.
Claim 11
Dependent Claim
23 words
The combination claimed in claim 8 in further combination with means open to the atmosphere for collecting particulate material discharged from the hopper.
References Cited (Backward Citations)
US3462920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |