US4955427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Placement of particulates onto refractory filters for liquid metals
Assignee: AMFILEX Ltd
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Filing: 1989-05-15
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Granted: 1990-09-11
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Expires: 2009-05-15
Abstract
Abstract A filter for molten metal with a particulate coating for simultaneously metallurgically treating and filtering is disclosed. A layer of particulates such as ferroalloy, deoxidizer, grain refiner, inoculant or master alloy is placed on the surface of a hard-fired ceramic or refractory cloth filter for treating liquid metal. The particles are held in place by a coating of carbonaceous resin which is applied to the surface of the filter and which also protects the filter and particles against abrasion and moisture. The placement of the particulate additives on the filter allows the molten metal to be metallurgically treated and filtered simultaneously.
Inventors
- 👤 Jay R. Hitchings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:39
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/08; B22C9/086; B22D; B22D27/00; B22D27/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
In a casting mold, a filter for metallurgically filtering and treating molten metal with particulate additives comprising: 1. a hard fired ceramic or refractory cloth filter, with particulate additives placed on the surface of the filter and encapsulated in a char forming carbonaceous resin coating.
Claim 2
Dependent Claim
45 words
In a casting mold, a filter for metallurgically filtering and treating molten metal with particulate additives comprising: 1. a hard fired ceramic or refractory cloth filter, with particulate additives placed on the surface of the filter and encapsulated in a char forming carbonaceous resin coating.
Claim 3
Dependent Claim
24 words
The casting mold of claim 1 wherein said particulate additives are selected from the group comprising ferroalloys, inoculants, grain refiners, deoxidizers, and master alloys.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |