Patent US4333138A successfully refreshed from Google Patents.
US4834876A
Expired / Lapsed
US
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Filtration assembly having integral heating means for maintaining the metallic material being filtered in the molten state
Assignee: Individual
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Filing: 1988-03-14
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Granted: 1989-05-30
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Expires: 2008-03-14
Abstract
Abstract The filtration of molten metal is obtained by providing the filtration medium, which may, for example, be formed of a granulated material, with a conductive coating or conductive particles. Electrical energy is coupled across the filter to create a current flow through the conductive material. The magnitude of the current generates heat of a level sufficient to maintain the metallic material being filtered in the molten state as it passes through the filter medium. The granules may be covered with a conductive coating or conductive particles. In an alternative embodiment, the granules may be formed of a material, such as silicon carbide, which is capable of being inductively heating to maintain the metallic material being filtered in the molten state as it is passed through the filter medium.
Inventors
- 👤 Nicholas G. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:41
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/18; B01D29/00; B01D29/01; B01D29/03; B01D35/06; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/116; B22D11/119
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A filter apparatus for heating the filter media suitable for the filtration of molten metallic material delivered to the filter apparatus in the molten state and for maintaining the metallic material in the molten stage during filtration thereof, said filter structure being comprised of: a filter media in granulated form; said filter media having a conductive material deposited thereon; a pair of electrical contacts being coupled to the perimeter of said filter media for coupling electrical energy from a power source to said filter, said power source being sufficient to develop a current in said conductive material, said current being of a magnitude sufficient to develop I 2 R heat loss to achieve the desired pre-heating level preparatory to initiation of flow of the molten metallic material delivered to said apparatus for passage and filtration through said filter media.
Claim 2
Dependent Claim
139 words
A filter apparatus for heating the filter media suitable for the filtration of molten metallic material delivered to the filter apparatus in the molten state and for maintaining the metallic material in the molten stage during filtration thereof, said filter structure being comprised of: a filter media in granulated form; said filter media having a conductive material deposited thereon; a pair of electrical contacts being coupled to the perimeter of said filter media for coupling electrical energy from a power source to said filter, said power source being sufficient to develop a current in said conductive material, said current being of a magnitude sufficient to develop I 2 R heat loss to achieve the desired pre-heating level preparatory to initiation of flow of the molten metallic material delivered to said apparatus for passage and filtration through said filter media.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein the conductive material is comprised of a conductive coating of a predetermined thickness provided on said filter media.
Claim 4
Dependent Claim
13 words
The apparatus of claim 2 wherein said conductive coating is comprised of nickel.
Claim 5
Dependent Claim
52 words
The apparatus of claim 1 wherein said filter is arranged within a supporting structure having sealing means of sealing the interface between the supporting structure and the perimeter of said filter media; said electrodes being incorporated into said sealing means to provide suitable electrical contact between said electrodes and said filter media.
Claim 6
Dependent Claim
27 words
The apparatus of claim 1 wherein the conductive material is distributed through the filter media in such a manner as to provide uniform heating of the media.
Claim 7
Dependent Claim
22 words
The apparatus of claim 5 wherein the conductive material is distributed throughout the media in a non-uniform manner to obtain uniform current.
Claim 8
Dependent Claim
61 words
Filter apparatus for use in filtering molten metallic media comprising: a filter media incorporating magnetically susceptible material; a supporting structure for supporting said filter media; induction means surrounding said filter media for heating said filter media by induction upon energization of said induction means for pre-heating the filter media to a level sufficient to assure appropriate filtration of the molten material.
Claim 9
Dependent Claim
61 words
Filter apparatus for use in filtering molten metallic media comprising: a filter media incorporating magnetically susceptible material; a supporting structure for supporting said filter media; induction means surrounding said filter media for heating said filter media by induction upon energization of said induction means for pre-heating the filter media to a level sufficient to assure appropriate filtration of the molten material.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7 wherein said induction means comprises an induction coil surrounding said supporting structure.
Claim 11
Dependent Claim
20 words
The apparatus of claim 8 wherein said induction means comprises an induction coil imbedded within said filter media supporting means.
Claim 12
Dependent Claim
16 words
The apparatus of claim 7 wherein said filter media is comprised of granules of silicon carbide.
Claim 13
Dependent Claim
114 words
A filter apparatus for heating the filter media suitable for the filtration of molten metallic material delivered to the filter media in the molten state, said filter structure being comprised of: a filter media preferably in granulated form; the granules of said filter media having a conductive material admixed therewith; a pair of electrical contacts being coupled to the perimeter of said filter media for coupling electrical energy to said filter to develop a current in said conductive material, said current being of a magnitude sufficient to develop I 2 R heat loss to achieve the desired pre-heating level preparatory to initiation of flow of the molten metallic material passed through said filter media.
Claim 14
Dependent Claim
114 words
A filter apparatus for heating the filter media suitable for the filtration of molten metallic material delivered to the filter media in the molten state, said filter structure being comprised of: a filter media preferably in granulated form; the granules of said filter media having a conductive material admixed therewith; a pair of electrical contacts being coupled to the perimeter of said filter media for coupling electrical energy to said filter to develop a current in said conductive material, said current being of a magnitude sufficient to develop I 2 R heat loss to achieve the desired pre-heating level preparatory to initiation of flow of the molten metallic material passed through said filter media.
Claim 15
Independent Claim
110 words
A method for pre-heating a filter media employed for filtration of molten metallic material delivered to the filter media in the molten state comprising the steps of: providing a filter media comprised a granules having a conductive material deposited thereon; supporting said filter media within a supporting structure; providing a pair of electrodes electrically coupled to said filter media; coupling an electrical energy source to said electrode to heat said filter media by induction, said energy source providing energy of a level sufficient to heat the filter media to a temperature capable of maintaining the molten metallic material in the molten state for achieving proper filtration of the molten material.
Claim 16
Independent Claim
110 words
A method for pre-heating a filter media employed for filtration of molten metallic material delivered to the filter media in the molten state comprising the steps of: providing a filter media comprised a granules having a conductive material deposited thereon; supporting said filter media within a supporting structure; providing a pair of electrodes electrically coupled to said filter media; coupling an electrical energy source to said electrode to heat said filter media by induction, said energy source providing energy of a level sufficient to heat the filter media to a temperature capable of maintaining the molten metallic material in the molten state for achieving proper filtration of the molten material.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |