US4131456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chill-free foundry iron
Assignee: Individual
•
Filing: 1977-12-12
•
Granted: 1978-12-26
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Expires: 1997-12-12
Abstract
Abstract The invention provides a chill-free foundry iron consisting essentially of, in per cent by weight: }carbon from 2.8 to 4.0 }silicon from 1.5 to 2.6 }manganese from 0.2 to 1.2 }cerium from 0.01 to 0.05 }aluminium from 0.06 to 0.6 }calcium from 0.04 to 0.1 }sulfur up to 0.20 }phosphorus up to 0.30 and }iron the balance }
Inventors
- 👤 Lev V. Peregudov
- 👤 Mikhail M. Malashin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:14
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A chill-free foundry iron consisting essentially of, in per cent by weight: ______________________________________
carbon from 2.8 to 4.0
silicon from 1.5 to 2.6
manganese from 0.2 to 1.2
cerium from 0.01 to 0.05
aluminium from 0.06 to 0.6
calcium from 0.04 to 0.10
sulfur up to 0.20
phosphorus up to 0.30
and iron the balance
______________________________________
Claim 2
Dependent Claim
56 words
A chill-free foundry iron consisting essentially of, in per cent by weight: ______________________________________
carbon from 2.8 to 4.0
silicon from 1.5 to 2.6
manganese from 0.2 to 1.2
cerium from 0.01 to 0.05
aluminium from 0.06 to 0.6
calcium from 0.04 to 0.10
sulfur up to 0.20
phosphorus up to 0.30
and iron the balance
______________________________________
Claim 3
Dependent Claim
14 words
Chill-free foundry iron in a casting having a thickness of less than 4 mm.
Claim 4
Dependent Claim
14 words
Chill-free foundry iron in a casting having a thickness of less than 4 mm.
Claim 5
Dependent Claim
19 words
A casting of claim 2 wherein the thickness of the chilled surface layer ranges from 0.0 to 1.8 mm.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |