Patent US4029000A successfully refreshed from Google Patents.
US4029000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection pump for injecting molten metal
Assignee: Denka Co Ltd
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Filing: 1975-06-12
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Granted: 1977-06-14
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Expires: 1995-06-12
Abstract
Abstract The cylinder and piston of an injection pump which are severely corroded by molten aluminum or the like are made of a composite sintered body containing two or more of the compounds selected from the group consisting of boron carbide, titanium diboride, zirconium diboride and boron nitride, and having excellent corrosion resistant, wear resistant and heat shock properties and high mechanical strength. One or more of the compounds selected from the group consisting of borides of tantalum, molybdenum and tungsten; carbides of silicon, zirconium, tantalum, vanadium,chromium, tungsten and molybdenum; nitrides of titanium, aluminum, silicon and zirconium; and oxides of aluminum and beryllium may be incorporated.
Inventors
- 👤 Hiromi Nakamura
- 👤 Yosizo Komiyama
- 👤 Mitsuo Yamashita
- 👤 Masaji Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:49
CPC Classifications
F; F04; F04B; F04B15/00; F04B15/04; B; B22; B22D; B22D17/00; B22D17/20; B22D17/2015; F04B53/00; F04B53/14; F04B53/16; F04B53/162; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/025; F05C2201/04; F05C2201/0433; F05C2201/0466; F05C2201/0469; F05C2201/0475; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/083; F05C2253/00; F05C2253/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
In an injection pump including a cylinder and a piston slidably received in said cylinder for injecting molten metal, the improvement wherein at least one of said cylinder and said piston are made of a composite sintered body consisting essentially of a mixture of 10-90% by weight of boron carbide and at least one compound selected from the group consisting of 5-90% by weight of titanium diboride, 5-90% by weight of zirconium diboride and 0.5-30% by weight of boron nitride.
Claim 2
Dependent Claim
80 words
In an injection pump including a cylinder and a piston slidably received in said cylinder for injecting molten metal, the improvement wherein at least one of said cylinder and said piston are made of a composite sintered body consisting essentially of a mixture of 10-90% by weight of boron carbide and at least one compound selected from the group consisting of 5-90% by weight of titanium diboride, 5-90% by weight of zirconium diboride and 0.5-30% by weight of boron nitride.
Claim 3
Dependent Claim
29 words
The improved injection pump of claim 1 wherein the composite sintered body is a mixture of 10-90% by weight of boron carbide and 5-90% by weight of titanium diboride.
Claim 4
Dependent Claim
29 words
The improved injection pump of claim 1 wherein the composite sintered body is a mixture of 10-90% by weight of boron carbide and 5-90% by weight of zirconium diboride.
Claim 5
Dependent Claim
18 words
The improved injection pump of claim 2 wherein said mixture further contains 5-90% by weight of zirconium diboride.
Claim 6
Dependent Claim
19 words
The improved injection pump according to claim 2 wherein said mixture further contains 0.5% to 30% of boron nitride.
Claim 7
Dependent Claim
19 words
The improved injection pump according to claim 3 which further contains 0.5% to 30% by weight of boron nitride.
Claim 8
Dependent Claim
21 words
The improved injection pump according to claim 4 wherein said mixture further contains 0.5% to 30% by weight of boron nitride.
Claim 9
Dependent Claim
60 words
The improved injection pump according to claim 3, wherein said composite sintered body consists of less than 30% by weight of at least one compound selected from the group consisting of borides of tantalum, molybdenum and tungsten; carbides of zirconium, silicon, tantalum, vanadium, chromium, tungsten, and molybdenum; nitrides of aluminum, silicon, titanium and zirconium; and oxides of aluminum and beryllium.
Claim 10
Dependent Claim
60 words
The improved injection pump according to claim 3 wherein said composite sintered body further comprises less than 30% by weight of at least one compound selected from the group consisting of borides of tantalum, molybdenum and tungsten; carbides of zirconium, silicon, tantalum, vanadium, chromium, tungsten, and molybdenum; nitrides of aluminum, silicon, titanium and zirconium; and oxides of aluminum and beryllium.
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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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |