US5575705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry blasting process
Assignee: Church and Dwight Co Inc
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Filing: 1995-01-10
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Granted: 1996-11-19
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Expires: 2015-01-10
Abstract
Abstract An improved slurry blasting process is disclosed wherein a liquid carrier medium such as water contains a dispersed water-soluble particulate abrasive to enhance blast cleaning efficiency and wherein the liquid carrier comprises a saturated solution such as the dissolved particulate abrasive so as to minimize the dissolution of the particulate abrasive therein. Slurry blasting at relatively low pressures below 500 psi and at room temperature provides effective and cost efficient cleaning of substrates. The slurry can be recovered and continuously reused. A recrystallization agent can be added to the slurry to increase abrasive particulate growth in the saturated solution.
Inventors
- 👤 Benny S. Yam
- 👤 Robert C. Jorgensen
- 👤 William E. Spears, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:19
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0007; B24C7/0015; B08; B08B; B08B3/00; B08B3/04; B08B3/06; B08B3/10; B08B3/102; B08B7/00; B08B7/02; B24C1/00; B24C1/003; B24C1/08; B24C1/086; B24C11/00; B24C11/005; B24C9/00; B24C9/006; H; H05; H05K; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2203/00; H05K2203/02; H05K2203/025; H05K2203/07; H05K2203/0736; H05K2203/0743; H05K2203/0779; H05K2203/0786; H05K2203/0793; H05K3/00; H05K3/22; H05K3/26; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
131 words
A process for blast cleaning comprising; subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate abrasive so as to minimize dissolution of said particulate abrasive therein, said blast stream being directed to said work surface by means of a venturi nozzle wherein said blast stream is accelerated through a restricting orifice and subsequently through an expanding outlet section of said nozzle, said blast stream being formed prior to entering said venturi nozzle and directed through said nozzle by a pressurized air stream, said slurry being directed through said nozzle and at said work surface at a pressure of less than 500 psi.
Claim 2
Dependent Claim
131 words
A process for blast cleaning comprising; subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate abrasive so as to minimize dissolution of said particulate abrasive therein, said blast stream being directed to said work surface by means of a venturi nozzle wherein said blast stream is accelerated through a restricting orifice and subsequently through an expanding outlet section of said nozzle, said blast stream being formed prior to entering said venturi nozzle and directed through said nozzle by a pressurized air stream, said slurry being directed through said nozzle and at said work surface at a pressure of less than 500 psi.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said carrier liquid is water and said particulate abrasive is water soluble.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein said water soluble particulate abrasive comprises alkali metal and alkaline earth metal salts.
Claim 5
Dependent Claim
32 words
The process of claim 3 wherein said particulate abrasive is selected from the water soluble alkali metal and alkaline earth metal chlorides, chlorates, carbonates, bicarbonates, sesquicarbonates, sulfates, silicates and the hydrates thereof.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein said particulate abrasive comprises the alkali metal carbonates or bicarbonates.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said particulate abrasive comprises sodium bicarbonate.
Claim 8
Dependent Claim
33 words
The process of claim 2 wherein said saturated solution comprises dissolved water soluble material in water wherein said dissolved soluble material comprises at least a portion of material other than said abrasive material.
Claim 9
Dependent Claim
39 words
The process of claim 2 wherein said carrier liquid contains an adjuvant other than said particulate abrasive material to aid in the removal of contaminants from said work surface or to provide a post-treatment characteristic to said work surface.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein said adjuvant is at least one surfactant.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein said adjuvant comprises alkaline builder salts.
Claim 12
Dependent Claim
11 words
The process of 8 wherein said adjuvant comprises an anti-corrosion agent.
Claim 13
Dependent Claim
11 words
The process of 8 wherein said adjuvant comprises an anti-corrosion agent.
Claim 14
Dependent Claim
18 words
The process of claim 11 wherein said anticorrosion agent is an orthophosphate and said work surface contains zinc.
Claim 15
Dependent Claim
15 words
The process of claim 1 wherein said slurry is pressurized to less than 125 psi.
Claim 16
Dependent Claim
38 words
The process of claim 1 wherein subsequent to contact of said blast stream with said work surface, recovering at least a portion of said slurry and recycling at least a portion of said slurry to said blast stream.
Claim 17
Dependent Claim
18 words
The process of claim 14 wherein said carrier liquid is water and said particulate abrasive is water soluble.
Claim 18
Dependent Claim
15 words
The process of claim 15 wherein said particulate abrasive comprises alkali metal cabonates or bicarbonates.
Claim 19
Dependent Claim
12 words
The process of claim 16 wherein said particulate abrasive comprises sodium bicarbonate.
Claim 20
Dependent Claim
24 words
The process of claim 14 wherein said recovered slurry is treated to increase the crystal growth of said particulate abrasive material in said slurry.
Claim 21
Dependent Claim
21 words
The process of claim 18 wherein said crystal growth treatment comprises the addition of a recrystallization agent to said recovered slurry.
Claim 22
Dependent Claim
16 words
The process of claim 1 wherein said work surface comprises the interior of a hollow article.
Claim 23
Dependent Claim
27 words
The process of claim 20 wherein said hollow article comprises an open-ended pipe in which the blast stream is directed onto the interior surfaces of said pipe.
Claim 24
Dependent Claim
41 words
The process of claim 21 wherein subsequent to contact of the blast stream with the interior surface of said pipe, recovering at least a portion of said slurry and recycling at least a portion of said slurry to said blast stream.
Claim 25
Dependent Claim
104 words
A process for blast cleaning comprising; subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate material so as to minimize dissolution of said particulate abrasive therein, subsequent to contact of said blast stream with said work surface, recovering at least a portion of said slurry, treating said recovered slurry to increase the crystal growth of said particulate abrasive material in said slurry and recycling at least a portion of said slurry to said blast stream.
Claim 26
Dependent Claim
104 words
A process for blast cleaning comprising; subjecting a work surface to a blast stream comprising a slurry of a carrier liquid and a particulate abrasive material which is soluble in said carrier liquid, said carrier liquid comprising a saturated solution of said soluble particulate material so as to minimize dissolution of said particulate abrasive therein, subsequent to contact of said blast stream with said work surface, recovering at least a portion of said slurry, treating said recovered slurry to increase the crystal growth of said particulate abrasive material in said slurry and recycling at least a portion of said slurry to said blast stream.
Claim 27
Dependent Claim
17 words
The process of claim 23 wherein said carrier liquid is water and said particulate abrasive is water-soluble.
Claim 28
Dependent Claim
18 words
The process of claim 24 wherein said water-soluble particulate abrasive comprises alkali metal and alkaline earth metal salts.
Claim 29
Dependent Claim
12 words
The process of claim 25 wherein said particulate abrasive comprises sodium bicarbonate.
Claim 30
Dependent Claim
40 words
The process of claim 24 wherein said carrier liquid contains an adjuvant other than said particulate abrasive material to aid in the removal of contaminants from said work surface or to provide a post treatment characteristic to said work surface.
Claim 31
Dependent Claim
13 words
The process of claim 27 wherein said adjuvant is at least one surfactant.
Claim 32
Dependent Claim
12 words
The process of claim 27 wherein said adjuvant comprises alkaline builder salts.
Claim 33
Dependent Claim
12 words
The process of claim 27 wherein said adjuvant comprises an anti-corrosion agent.
Claim 34
Dependent Claim
21 words
The process of claim 23 wherein said crystal growth treatment comprises the addition of a recrystallization agent to said recovered slurry.
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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) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |