US3934637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting of molten metals
Assignee: Foseco International Ltd
•
Filing: 1974-03-14
•
Granted: 1976-01-27
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Expires: 1994-03-14
Abstract
Abstract The surface quality of bottom poured ingots can be improved by placing on the mould floor, prior to pouring, a bonded composition of one or more fluxing agents and expandable graphite.
Inventors
- 👤 Pierre Roger Potier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:45
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
In the process of ingot casting wherein molten metal is bottom poured into an ingot mould to form an ingot, the improvement which comprises locating in the ingot mould, prior to the commencement of pouring, a bonded composition comprising at least one fluxing agent and expandable graphite, said composition being borne up on the rising molten metal surface as the molten metal is poured and disintegrating because of the heat of said metal and the expansion of the graphite and thereafter fusing to form a fluxing cover on the surface of the molten metal thereby minimizing surface oxidation and surface inclusions.
Claim 2
Dependent Claim
101 words
In the process of ingot casting wherein molten metal is bottom poured into an ingot mould to form an ingot, the improvement which comprises locating in the ingot mould, prior to the commencement of pouring, a bonded composition comprising at least one fluxing agent and expandable graphite, said composition being borne up on the rising molten metal surface as the molten metal is poured and disintegrating because of the heat of said metal and the expansion of the graphite and thereafter fusing to form a fluxing cover on the surface of the molten metal thereby minimizing surface oxidation and surface inclusions.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the fluxing agent is selected from the class consisting of iron oxide, alkali metal and alkaline earth metal fluorides, carbonates and oxides, silicates, borates and fly ash.
Claim 4
Dependent Claim
24 words
The process according to claim 1 wherein the fluxing agent is in particulate form and the particles thereof are coated with finely divided carbon.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the composition comprises, by weight: fluxing agent 60 - 90%
expandable graphite 0.5 - 10%
binder 10 - 30%
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the composition is bonded with a binding agent selected from the class consisting of natural and synthetic resins, gums, starches, cellulose derivatives, alkali metal silicates, colloidal oxide hydrosols and clays.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the composition includes fibrous material.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the composition includes a particulate refractory filler.
References Cited (Backward Citations)
US2265740A
Cited
US3323869A
Cited
US3246374A
Cited
US3308514A
Cited
US3431970A
Cited
US3685986A
Cited
US3612155A
Cited
US3810506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |