US3604494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of composite ingots of magnesium containing prealloys
Assignee: GEA Group AG
•
Filing: 1967-10-02
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Granted: 1971-09-14
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Expires: 1987-10-02
Abstract
Abstract Compact, magnesium containing prealloy ingots are produced by casting a molten magnesium containing prealloy around prefabricated solid pieces of a prealloy having the same or similar composition as that of the molten prealloy. The resulting compact prealloy ingots are used in the production of cast iron with spheroidal graphite.
Inventors
- 👤 Heiner Trager
- 👤 Albert Kaune
- 👤 Horst Muhlberger
- 👤 Karl Josef Reifferscheid
- 👤 Ludwig Grimm
- 👤 Gerhard Wagner
- 👤 Heinrich Haslinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
C; C22; C22C; C22C35/00; B; B22; B22D; B22D21/00; B22D21/002; B22D21/007; C21; C21C; C21C1/00; C21C1/10; C21C1/105; C22C24/00; C22C25/00; C22C28/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
A process in claim 1 in which said mold has an internal volume of about 0.05 to 3 cubic feet.
Claim 2
Dependent Claim
23 words
A process as in claim 2 in which said solid pieces occupy about 25 to 75 percent of the space in said mold.
Claim 3
Dependent Claim
86 words
A process as in claim 3 in which a) is accomplished by i. forming, in the bottom of said mold, with a relatively small number of said pieces of about 30 to 60 mm. average diameter in size, a pallet having a load bearing surface equal to about three-fourths to four-fifths of the cross-sectional area of said mold, and loading the remainder of said pieces on said load-bearing surface, each of the remainder of said pieces having an average diameter of about 10 to 50 mm.
Claim 4
Dependent Claim
33 words
A process as in claim 4 in which all the prealloy used is of the type used in the treatment of cast iron melts for the production of cast iron with spheroidal graphite.
Claim 5
Dependent Claim
47 words
A process as in claim 5 in which all the prealloy has the composition 20-60 percent magnesium 1-10 percent calcium <20 percent iron 0-12 percent rare earth metals <1.5 percent impurities remainder silicon containing materials selected from the group consisting of silicon and nickel and copper silicides.
Claim 6
Dependent Claim
43 words
A process as in claim 5 in which said ingot is formed with a core having a composition different from that of the remainder of said ingot by using for said core prealloy in piece form having the composition desired for said core.
Claim 7
Dependent Claim
20 words
A process as in claim 7 in which said core is formed from prealloy containing magnesium and rare earth metals.
References Cited (Backward Citations)
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US2988444A
Cited
US2726152A
Cited
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Cited
US3373794A
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |