Patent US3930875A successfully refreshed from Google Patents.
US3930875A
Expired / Lapsed
US
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Pump member for molten metal
Assignee: Toshiba Corp
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Filing: 1973-04-24
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Granted: 1976-01-06
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Expires: 1993-04-24
Abstract
Abstract A pump member for molten metal manufactured from a sintered mass including aluminium nitride as a major component and 0.1 to 10% by weight of at least one oxide selected from the group consisting of oxides of Group IIIA elements of the Periodic Table.
Inventors
- 👤 Toshihiko Ochiai
- 👤 Mitsutoshi Hirano
- 👤 Hiroshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; F; F04; F04B; F04B15/00; F04B15/04; F04B53/00; F04B53/14; F05; F05B; F05B2230/00; F05B2230/40; F05B2230/41; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0466; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/083; F05C2203/0834; F05C2253/00; F05C2253/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A pump member of a hot chamber type aluminium metal die casting machine which directly contacts molten aluminium metal in operation, consisting essentially of a sintered mass of a powdered mixture of the following ingredients in the percentages by weight indicated: rare earth oxide 0.1 to 10%
metal silicate 0.2 to 8%
aluminum oxide 0 to 10%
aluminum nitride balance, wherein said metal silicate is selected from the group consisting of aluminium silicate, magnesium silicate, calcium silicate, feld spars, augites, olivines and micas.
Claim 2
Dependent Claim
83 words
A pump member of a hot chamber type aluminium metal die casting machine which directly contacts molten aluminium metal in operation, consisting essentially of a sintered mass of a powdered mixture of the following ingredients in the percentages by weight indicated: rare earth oxide 0.1 to 10%
metal silicate 0.2 to 8%
aluminum oxide 0 to 10%
aluminum nitride balance, wherein said metal silicate is selected from the group consisting of aluminium silicate, magnesium silicate, calcium silicate, feld spars, augites, olivines and micas.
Claim 3
Dependent Claim
38 words
The pump member of claim 1, wherein said rare earth oxide is selected from the group consisting of Y 2 O 3 , La 2 O 3 , Sc 2 O 3 and Ce 2 O 3 .
Claim 4
Dependent Claim
19 words
The pump member of claim 2 wherein the amount of said metal silicate is 0.2 to 5% by weight.
Claim 5
Dependent Claim
18 words
The pump member of claim 3 wherein the amount of aluminium oxide is 0.5 to 5% by weight.
Claim 6
Dependent Claim
18 words
The pump member of claim 1 wherein the amount of aluminium oxide is 0.5 to 10% by weight.
Claim 7
Dependent Claim
24 words
The pump member of claim 1, wherein said sintered mass has a tensile strength at normal temperature of about 25 to 30Kg/mm 2 .
Claim 8
Dependent Claim
21 words
The pump member of claim 1, wherein the amount of said rare earth oxide is between 0.2 to 4.5% by weight.
References Cited (Backward Citations)
US3108887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |