US4225544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fabricating a sparger plate for use in degassing of molten metal
Assignee: Rio Tinto Switzerland AG
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Filing: 1979-04-25
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Granted: 1980-09-30
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Expires: 1999-04-25
Abstract
Abstract An improved method for fabricating a ceramic sparger plate for use in the degassing of molten metal is disclosed in which a castable ceramic is poured into a mold which contains an array of vertically disposed strands which are removed subsequent to the ceramic curing and prior to firing of the ceramic thus leaving the desired pattern of holes through which the fluxing gas is introduced into the molten metal.
Inventors
- 👤 Jonathan A. Dantzig
- 👤 Derek E. Tyler
- 👤 Richard C. Milici
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066; B; B28; B28B; B28B7/00; B28B7/16; B28B7/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
An improved method for manufacturing a sparger plate for use in the degassing of molten metal, comprising: providing a mold means consisting of at least a base means and side wall means; securing to said base means an array of strand receiving cores of controlled spacing for receiving strand means in a plane vertical to said base means; locating said strand means of controlled size in said strand receiving cores; pouring a castable ceramic into said mold means; allowing said castable ceramic to cure; removing said strand means from said strand receiving cores; and firing said cured ceramic so as to develop a cast ceramic sparger plate characterized by an array of holes of controlled size and spacing.
Claim 2
Dependent Claim
118 words
An improved method for manufacturing a sparger plate for use in the degassing of molten metal, comprising: providing a mold means consisting of at least a base means and side wall means; securing to said base means an array of strand receiving cores of controlled spacing for receiving strand means in a plane vertical to said base means; locating said strand means of controlled size in said strand receiving cores; pouring a castable ceramic into said mold means; allowing said castable ceramic to cure; removing said strand means from said strand receiving cores; and firing said cured ceramic so as to develop a cast ceramic sparger plate characterized by an array of holes of controlled size and spacing.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein said array of strand receiving cores consists of a plurality of wood cores secured to said base means.
Claim 4
Dependent Claim
25 words
A method according to claim 1 wherein said array of strand receiving cores consists of a plurality of wax cores secured to said base means.
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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |