Patent US4540477A successfully refreshed from Google Patents.
US4540477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing acicular or equiaxed iron or iron alloy particles
Assignee: Olin Corp
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Filing: 1984-01-12
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Granted: 1985-09-10
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Expires: 2004-01-12
Abstract
Abstract An apparatus for collecting ferromagnetic particles distributed in metal or metal alloy material is disclosed. A tank containing an electrolyte is provided to electrochemically dissolve the metal or metal alloy material without substantial dissolving of the particles. A support surface is provided within the electrolyte for supporting the dissolving metal material and collecting undissolved particles. The support surface further comprises the working electrode in conjunction with the metal material. A magnetic field forming device is associated with the support surface for magnetically adhering undissolved particles to the support surface so as to maximize recovery of the particles.
Inventors
- 👤 Lifun Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:52
CPC Classifications
C; C25; C25F; C25F5/00; B; B22; B22F; B22F1/00; B22F1/06; B22F1/062; B22F9/00; B22F9/16; C25F7/00; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
An apparatus for collecting ferromagnetic equiaxed particles distributed in metal or metal alloy material, comprising: means for electrochemically dissolving said metal or metal alloy material without substantial dissolving of said ferromagnetic particles, said means for electrochemically dissolving including: a tank containing an electrolyte; support surface means in said tank, said support surface means being electrically conductive and in electrical contact with the dissolving metal or metal alloy material; a working electrode comprising said support surface means and the metal or metal alloy material; a counter electrode disposed in said tank; means for passing an electrical current between said working electrode and said counter electrode; and magnetic field forming means associated with said support surface means for magnetically adhering dissolved ferromagnetic particles and pieces of metal or metal alloy material having undissolved ferromagnetic particles distributed therein to said support surface means so as to enhance the dissolution of the metal or metal alloy material and maximize recovery of said equiaxed ferromagnetic particles.
Claim 2
Independent Claim
161 words
An apparatus for collecting ferromagnetic equiaxed particles distributed in metal or metal alloy material, comprising: means for electrochemically dissolving said metal or metal alloy material without substantial dissolving of said ferromagnetic particles, said means for electrochemically dissolving including: a tank containing an electrolyte; support surface means in said tank, said support surface means being electrically conductive and in electrical contact with the dissolving metal or metal alloy material; a working electrode comprising said support surface means and the metal or metal alloy material; a counter electrode disposed in said tank; means for passing an electrical current between said working electrode and said counter electrode; and magnetic field forming means associated with said support surface means for magnetically adhering dissolved ferromagnetic particles and pieces of metal or metal alloy material having undissolved ferromagnetic particles distributed therein to said support surface means so as to enhance the dissolution of the metal or metal alloy material and maximize recovery of said equiaxed ferromagnetic particles.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said magnetic field forming means is located outside of said tank.
Claim 4
Dependent Claim
23 words
The apparatus of claim 2 wherein said support surface means comprises a container having an open top, side walls and a bottom floor.
Claim 5
Dependent Claim
21 words
The apparatus of claim 3 wherein said magnetic field forming means is further located below the bottom floor of said container.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4 wherein said magnetic filled forming means is a permanent magnet.
Claim 7
Dependent Claim
18 words
The apparatus of claim 4 wherein said magnetic forming means is an electromagnet type magnet in its place.
Claim 8
Dependent Claim
20 words
The apparatus of claim 3 wherein said magnetic field forming means is encapsulated within the bottom floor of said container.
Claim 9
Dependent Claim
22 words
The apparatus of claim 3 wherein said magnetic forming means is an electromagnet comprising a coil of wire wrapped around said container.
Claim 10
Dependent Claim
14 words
The apparatus of claim 8 wherein said container is formed of a ferromagnetic alloy.
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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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |