US4233089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-alloyed steel for the preparation of valve spring wire
Assignee: Garphytte Bruk AB
•
Filing: 1978-11-13
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Granted: 1980-11-11
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Expires: 1998-11-13
Abstract
Abstract A valve spring wire having superior fatigue and relaxation properties is disclosed, comprising, in addition to iron, manganese and silicon, together with aluminum and nitrogen for obtaining a fine-grain effect.
Inventors
- 👤 Christer Lanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/04; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
Valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition, expressed in weight percent: ______________________________________
C 0.5 1.0%
Si 0.1 1.5%
Mn 1.0 2.0%
Al.sub.tot 0.01 0.05%
N 0.004 0.020%
______________________________________ the remainder being iron as well as normally occuring impurities.
Claim 2
Dependent Claim
59 words
Valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition, expressed in weight percent: ______________________________________
C 0.5 1.0%
Si 0.1 1.5%
Mn 1.0 2.0%
Al.sub.tot 0.01 0.05%
N 0.004 0.020%
______________________________________ the remainder being iron as well as normally occuring impurities.
Claim 3
Dependent Claim
45 words
Valve spring wire according to claim 1, characterized in that the steel consists essentially of the following composition expressed in % by weight: ______________________________________
C 0.6-0.8%
Si 0.1-1.0%
Mn 1.0-2.0%
Al.sub.tot 0.01-0.05%
N 0.004-0.020%
______________________________________ the remainder being iron as well as normally occurring impurities.
Claim 4
Dependent Claim
63 words
A valve spring for internal combustion engines made of valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition expressed in weight percent: ______________________________________
C 0.5-1.0%
Si 0.1-1.5%
Mn 1.0-2.0%
Al.sub.tot 0.01-0.05%
N 0.004-0.020%
______________________________________ the remainder being iron as well as normally occurring impurities.
Claim 5
Dependent Claim
63 words
A valve spring for internal combustion engines made of valve spring wire of low-alloyed steel, characterized in that the wire has been oil hardened and tempered and in that the steel consists essentially of the following composition expressed in weight percent: ______________________________________
C 0.5-1.0%
Si 0.1-1.5%
Mn 1.0-2.0%
Al.sub.tot 0.01-0.05%
N 0.004-0.020%
______________________________________ the remainder being iron as well as normally occurring impurities.
Claim 6
Dependent Claim
45 words
A valve spring as in claim 3, characterized in that the steel consists essentially of the following composition expressed in % by weight: ______________________________________
C 0.6-0.8%
Si 0.1-1.0%
Mn 1.0-2.0%
Al.sub.tot 0.01-0.05%
N 0.004-0.020%
______________________________________ the remainder being iron as well as normally occurring impurities.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |