Patent US4535576A successfully refreshed from Google Patents.
US4535576A
Expired / Lapsed
US
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Anti-static process for abrasive jet machining
Assignee: Pennwalt Corp
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Filing: 1984-03-28
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Granted: 1985-08-20
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Expires: 2004-03-28
Abstract
Abstract Abrasive jet machining apparatus employs a stream or mist of electrically grounded solution of a conducting electrolyte directed at or adjacent the work removal site of a workpiece to instantaneously discharge to ground all static charge build-up formed on the workpiece by the gas/abrasive powder stream as a result of the removal.
Inventors
- 👤 Rahul B. Shukla
- 👤 Douglas L. Shipman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:57
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C1/04; B24C3/00; B24C3/32; B24C3/322
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
Abrasive jet machining apparatus for removing portions of a workpiece comprising, a gas supply and means for containing said gas supply, an abrasive powder supply communicating with said gas supply, and means for containing said abrasive powder supply, means for providing a powder stream from said gas and abrasive powder, an electrically conducting electrolyte solution, connected to a ground, communicating with said gas supply, and means for containing said electrolyte solution, means for simultaneously delivering said powder stream and solution to said workpiece portions whereby build-up of static charges on said workpiece are instantaneously discharged to said ground through said electrolyte solution connected to said ground.
Claim 2
Dependent Claim
106 words
Abrasive jet machining apparatus for removing portions of a workpiece comprising, a gas supply and means for containing said gas supply, an abrasive powder supply communicating with said gas supply, and means for containing said abrasive powder supply, means for providing a powder stream from said gas and abrasive powder, an electrically conducting electrolyte solution, connected to a ground, communicating with said gas supply, and means for containing said electrolyte solution, means for simultaneously delivering said powder stream and solution to said workpiece portions whereby build-up of static charges on said workpiece are instantaneously discharged to said ground through said electrolyte solution connected to said ground.
Claim 3
Dependent Claim
17 words
Apparatus of claim 1 wherein said electrolyte solution is preferably an electrically conducting solution of sodium chloride.
Claim 4
Dependent Claim
17 words
Apparatus of claim 2 wherein concentration of said sodium chloride solution ranges between about 0.2 to 1.0%.
Claim 5
Dependent Claim
18 words
Apparatus of claim 1 wherein said electrolyte solution is contained within a metallic receptacle connected to said ground.
Claim 6
Dependent Claim
29 words
Apparatus of claim 1 wherein said electrolyte solution is contained within a non-metallic receptacle, a metallic article immersed in said contained solution, said metallic article connected to said ground.
Claim 7
Dependent Claim
17 words
Apparatus of claim 1 wherein said solution is delivered to said workpiece portions as a jet stream.
Claim 8
Dependent Claim
16 words
Apparatus of claim 1 wherein said solution is delivered to said workpiece portions as a mist.
Claim 9
Dependent Claim
25 words
Apparatus of claim 6 wherein said solution jet stream strikes said workpiece portions at an identical point where said powder stream impacts said workpiece portions.
Claim 10
Dependent Claim
13 words
Apparatus of claim 6 wherein said solution jet stream intersects said powder stream.
Claim 11
Dependent Claim
23 words
Apparatus of claim 6 wherein said solution jet stream strikes said workpiece portions adjacent point where said powder stream impacts said workpiece portions.
Claim 12
Dependent Claim
23 words
Apparatus of claim 7 wherein said mist strikes said workpiece portions at an identical point where said powder stream impacts said workpiece portions.
Claim 13
Dependent Claim
11 words
Apparatus of claim 7 wherein said mist intersects said powder stream.
Claim 14
Dependent Claim
21 words
Apparatus of claim 7 wherein said mist strikes said workpiece portions adjacent point where said powder stream impacts said workpiece portions.
References Cited (Backward Citations)
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Cited
US2387193A
Cited
US2669809A
Cited
US3858358A
Cited
US4412402A
Cited
US4437614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |