Patent US4924643A successfully refreshed from Google Patents.
US4924643A
Expired / Lapsed
US
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Method and apparatus for the treatment of work pieces by shot blasting
Assignee: Carboxyque Francaise SA
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Filing: 1989-02-03
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Granted: 1990-05-15
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Expires: 2009-02-03
Abstract
Abstract Particles of shot and particles of carbon dioxide ice are simultaneously blasted onto the work piece (6) to be treated. Application in the treatment of the surface of work pieces composed of plastics material or coated with a plastics material.
Inventors
- 👤 Alexandre Buiguez
- 👤 Claude Gibot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:58
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C1/003; B24C1/083; B24C11/00; B24C5/00; B24C5/02; B24C5/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A method for treating workpieces by simultaneous blasting of shot which is permanently solid at ambient temperature and particles of carbon dioxide ice, comprising feeding said shot to one lateral inlet of a nozzle having an axial inlet and two lateral inlets converging axially and an axial outlet of the convergent-divergent kind, feeding dry carbon dioxide ice particles to the other said lateral inlet, feeding a carrier gas to said axial inlet to provide a high velocity stream carrying both said shot and said ice particles, directing said high velocity stream against a said workpiece, thereafter recovering said shot and a portion of said carbon dioxide particles, cooling said recovered shot with additional carbon dioxide particles, and recycling said cooled recovered shot to said one inlet.
Claim 2
Independent Claim
126 words
A method for treating workpieces by simultaneous blasting of shot which is permanently solid at ambient temperature and particles of carbon dioxide ice, comprising feeding said shot to one lateral inlet of a nozzle having an axial inlet and two lateral inlets converging axially and an axial outlet of the convergent-divergent kind, feeding dry carbon dioxide ice particles to the other said lateral inlet, feeding a carrier gas to said axial inlet to provide a high velocity stream carrying both said shot and said ice particles, directing said high velocity stream against a said workpiece, thereafter recovering said shot and a portion of said carbon dioxide particles, cooling said recovered shot with additional carbon dioxide particles, and recycling said cooled recovered shot to said one inlet.
Claim 3
Dependent Claim
188 words
Apparatus for treating workpieces by a simultaneous blasting of shot which is permanently solid at ambient temperature and particles of carbon dioxide ice, comprising a hopper for storing the shot, means for producing dry particles of carbon dioxide ice, another hopper for storing said carbon dioxide particles in dry condition, a nozzle having two lateral inlets and an axial inlet, means for conveying shot from said shop hopper to one said lateral inlet of said nozzle, means for conveying carbon dioxide particles from said another hopper to the other said lateral inlet of said nozzle, means to supply gas under pressure to said axial inlet of said nozzle, thereby to produce a high velocity stream carrying both shot and ice particles, a cabin for enclosing a workpiece against which said high velocity stream is directed, means for recovering from said cabin said shot and part of said carbon dioxide particles, means for returning said recovered shot to said shot hopper thereby to recycle said shot, and means for cooling said recovered shot with additional carbon dioxide particles prior to the feeding of the recycled shot to said nozzle.
Claim 4
Dependent Claim
188 words
Apparatus for treating workpieces by a simultaneous blasting of shot which is permanently solid at ambient temperature and particles of carbon dioxide ice, comprising a hopper for storing the shot, means for producing dry particles of carbon dioxide ice, another hopper for storing said carbon dioxide particles in dry condition, a nozzle having two lateral inlets and an axial inlet, means for conveying shot from said shop hopper to one said lateral inlet of said nozzle, means for conveying carbon dioxide particles from said another hopper to the other said lateral inlet of said nozzle, means to supply gas under pressure to said axial inlet of said nozzle, thereby to produce a high velocity stream carrying both shot and ice particles, a cabin for enclosing a workpiece against which said high velocity stream is directed, means for recovering from said cabin said shot and part of said carbon dioxide particles, means for returning said recovered shot to said shot hopper thereby to recycle said shot, and means for cooling said recovered shot with additional carbon dioxide particles prior to the feeding of the recycled shot to said nozzle.
References Cited (Backward Citations)
FR999800A
Cited
FR2285961A1
Cited
DE2638323A1
Cited
DE2724318A1
Cited
US4478368A
Cited
US4555872A
Cited
US4655847A
Cited
FR2576821A1
Cited
US4773189A
Cited
EP0234365A1
Cited
JPS6475300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |