Patent US4797038A successfully refreshed from Google Patents.
US4797038A
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Powder recovery method and device
Assignee: S A M E S SA ZIRST CHEMIN DE MAIACHER 38240 MEYLAN FRANCE A FRENCH CORP
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Filing: 1986-08-20
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Granted: 1989-01-10
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Expires: 2006-08-20
Abstract
Abstract A method of recovering powder, for example in a powder-coating installation, uses processing plant adapted to operate at a pressure different to atmospheric pressure. Powder accumulating in a receptacle communicating with the processing plant is fluidized and a pressure head of fluidized powder is created to compensate the pressure difference imposed by the processing plant. A corresponding powder recovery device comprises processing plant adapted to operate at a pressure different to atmospheric pressure, a receptacle for the powder, a substantially vertical column through which this receptacle communicates with the processing plant, and structure for fluidizing at least the powder in this column. The processing plant may comprise a cyclone type separator, in which case the column is a pipe extending the cyclone downwardly. Alternatively, the processing plant may comprise a box having an air inlet and an air outlet and filters between the air inlet and the air outlet. In this case the column comprises a pipe coupled to the bottom of a hopper situated beneath the filters.
Inventors
- 👤 Jean-Yves Correard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:12
CPC Classifications
B; B04; B04C; B04C9/00; B05; B05B; B05B14/00; B05B14/40; B05B14/45; B05B14/48; B04C2009/002; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
A powder recovery system comprising means for processing powder, a receptacle adapted to receive said powder, a substantially vertical column, said substantially vertical column comprising means for permanently and directly fluidically communicating said powder processing means with said receptacle, and means for fluidizing at least said powder located within said column, wherein said receptacle is at atmospheric pressure and said powder processing means is at a pressure different from atmospheric pressure, wherein powder is maintained within said column.
Claim 2
Dependent Claim
78 words
A powder recovery system comprising means for processing powder, a receptacle adapted to receive said powder, a substantially vertical column, said substantially vertical column comprising means for permanently and directly fluidically communicating said powder processing means with said receptacle, and means for fluidizing at least said powder located within said column, wherein said receptacle is at atmospheric pressure and said powder processing means is at a pressure different from atmospheric pressure, wherein powder is maintained within said column.
Claim 3
Dependent Claim
35 words
A system in accordance with claim 1, said processing means comprising a cyclone-type separator, said separator being positioned above said column, wherein said column comprises a pipe connected to a lower portion of said separator.
Claim 4
Dependent Claim
20 words
A system in accordance with claim 2, wherein said separator has an upper cylindrical portion and a lower frustoconical portion.
Claim 5
Dependent Claim
29 words
A system in accordance with claim 3, wherein said upper portion of said separator includes a substantially horizontal inlet comprising means for conducting powder being recovered into said separator.
Claim 6
Dependent Claim
38 words
A system in accordance with claim 2, wherein said means for fluidizing said powder in said column comprises a porous plate positioned in a lower portion of said column and means for conducting compressed air through said plate.
Claim 7
Dependent Claim
23 words
A system in accordance with claim 2, wherein said column further comprises a substantially horizontally extending outlet for powder fluidized within said column.
Claim 8
Dependent Claim
21 words
A system in accordance with claim 6, wherein a porous surface is positioned in said column below said horizontally extending outlet.
Claim 9
Dependent Claim
59 words
A system in accordance with claim 1, said processing means comprising a box having an air inlet and an air outlet, at least one filter positioned in said box between said air inlet and said air outlet, and a hopper positioned beneath said filter, said column comprising a pipe which is connected to a bottom portion of said hopper.
Claim 10
Dependent Claim
22 words
A system in accordance with claim 8, wherein a plurality of filters are positioned between said air inlet and said air outlet.
Claim 11
Dependent Claim
18 words
A system in accordance with claim 8, wherein said pipe has a downwardly and outwardly flared bottom opening.
Claim 12
Independent Claim
55 words
A system in accordance with either of claims 2 or 8, said receptacle comprising a storage tank, said column including a lower portion extending into said storage tank, said storage tank being adapted to receive said powder, said storage tank including means for fluidizing said powder, said column being in fluidic communication with said tank.
Claim 13
Dependent Claim
53 words
A system in accordance with claim 11, wherein said lower portion of said column is substantially open, and is positioned directly above said means for fluidizing powder in said storage tank, wherein said means for fluidizing said powder within said storage tank also comprise said means for fluidizing said powder within said column.
Claim 14
Dependent Claim
35 words
A system in accordance in accordance with claim 12, wherein said lower portion of said column includes a downwardly diverging flange which comprises means for continually fluidizing powder in said lower portion of said column.
Claim 15
Dependent Claim
45 words
A system in accordance with claim 1, wherein said processing means comprises a box having an air inlet along a first side thereof and an air outlet along an upper portion thereof, with a plurality of filters being positioned between said inlet and said outlet.
Claim 16
Dependent Claim
21 words
A system in accordance with claim 14, wherein said inlet is horizontally attached to an inclined hopper portion of said box.
Claim 17
Dependent Claim
19 words
A system in accordance with claim 15, wherein a lower portion of said column is positioned within said receptacle.
Claim 18
Dependent Claim
39 words
A system in accordance with claim 16, wherein the bottom of said column is substantially open and is positioned adjacent a lower portion of said receptacle, wherein a plenum is positioned below a filter along said lower receptacle portion.
Claim 19
Independent Claim
73 words
A method of recovering powder using a processing device which is adapted to operate at a pressure different from atmospheric pressure, said method comprising accumulating powder in a receptacle and maintaining said receptacle in permanent and direct fluidic communication with said processing means via a substantially vertical column, and creating a pressure head of fluidized powder to compensate for the pressure difference between atmospheric pressure and the pressure imposed by said processing means.
Claim 20
Independent Claim
73 words
A method of recovering powder using a processing device which is adapted to operate at a pressure different from atmospheric pressure, said method comprising accumulating powder in a receptacle and maintaining said receptacle in permanent and direct fluidic communication with said processing means via a substantially vertical column, and creating a pressure head of fluidized powder to compensate for the pressure difference between atmospheric pressure and the pressure imposed by said processing means.
Claim 21
Dependent Claim
18 words
A method of recovering powder in accordance with claim 18, wherein said processing device comprises a cyclone separator.
Claim 22
Dependent Claim
33 words
A method of recovering powder in accordance with claim 19, wherein said processing means comprises a lower inlet, an upper outlet, and a plurality of filters positioned between said inlet and said outlet.
Claim 23
Dependent Claim
34 words
A method of recovering powder in accordance with claim 18, wherein said pressure head is created in said column, said column having an upper end attached to a lower end of said processing device.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |