Patent US4243414A successfully refreshed from Google Patents.
US4243414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slidable members for prime movers
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1978-10-27
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Granted: 1981-01-06
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Expires: 1998-10-27
Abstract
Abstract A slidable member for a prime mover made of an abrasion resistant liquid-phase sintered alloy, containing 0.5 to 4.0% by weight of carbon, 8.0 to 30.0% by weight of chromium, and 0.1 to 5.0% by weight of at least one of phosphorus, boron and silicon which permit liquid-phase sintering at not more than 1,250° C., and the balance iron. The sintered alloy has 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not more than 150μ.
Inventors
- 👤 Kentaro Takahashi
- 👤 Yoshikatsu Nakamura
- 👤 Masajiro Takeshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:28
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A slidable member for a prime mover made of an abrasion resistant liquid-phase sintered alloy, containing 0.5 to 4.0% by weight of carbon, 8.0 to 30.0% by weight of chromium, and 0.1 to 5.0% by weight of at least one of phosphorus, boron and silicon which permit liquid-phase sintering at not more than 1,250° C. and the balance iron, said alloy having 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not more than 150 μ.
Claim 2
Dependent Claim
88 words
A slidable member for a prime mover made of an abrasion resistant liquid-phase sintered alloy, containing 0.5 to 4.0% by weight of carbon, 8.0 to 30.0% by weight of chromium, and 0.1 to 5.0% by weight of at least one of phosphorus, boron and silicon which permit liquid-phase sintering at not more than 1,250° C. and the balance iron, said alloy having 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not more than 150 μ.
Claim 3
Dependent Claim
40 words
The slidable member of claim 1, wherein said alloy comprises carbon, chromium, and at least one of phosphorus, boron and silicon; not more than 10% by weight of one of Ni, Cu, Co and W metals and the balance iron.
Claim 4
Dependent Claim
34 words
The slidable member of claim 1, wherein said alloy comprises carbon, chromium, and at least one of phosphorus, boron and silicon; and not more than 20% by weight of Mo and the balance iron.
Claim 5
Dependent Claim
44 words
The slidable member of claim 1, wherein said alloy comprises carbon, chromium, and at least one of phosphorus, boron and silicon; and not more than 20% by weight of at least two of Ni, Mo, Cu, Co and W metals and the balance iron.
References Cited (Backward Citations)
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |