US3876422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated leaded steel casting
Assignee: Inland Steel Co
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Filing: 1973-10-03
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Granted: 1975-04-08
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Expires: 1993-10-03
Abstract
Abstract Uncropped, unworked, elongated, leaded steel castings, such as ingots, of commercial size (1,000 lbs. and heavier) or strand cast section. Lead content greater than 0.35 wt. percent and up to 0.70 wt. percent. Commercially acceptable surface. Lead present in inclusion form of microscopic size. No lead macroinclusions at bottom of uncropped ingot. No rare earths or lead oxide inclusions. Process for making is described.
Inventors
- 👤 Gregorio Asua Cantera
- 👤 Jose M Palacios Reparaz
- 👤 Louis Molnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:06
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60; C21; C21C; C21C7/00; C21C7/0006; C21C2007/0012
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
AN ELONGATED, UNCROPPED, AS-CAST UNWORKED CASTING COMPOSED OF LEADED STEEL AND COMPRISING: A WEIGHT GREATER THAN ABOUT 1000 POUNDS AND A COMMERCIALLY ACCEPTABLE SURFACE; A LEAD CONTENT GREATER THAN 0.35 WT. PERCENT AND UP TO 0.70 WT. PERCENT; LEAD INCLUSIONS, CONSISTING ESSENTIALLY OF MICROSCOPIC INCLUSIONS COMPRISING ELEMENTAL LEAD, DISTRUBTED THROUGOUT THE LENGTH OF SAID ELONGATED CASTING; SAID ELONGATED CAUSING BEING ESSENTIALLY DEVOID OF MACROSCOPIC LEAD INCLUSIONS THROUGHOUT ITS LENGTH INCLUDING THE BOTTOM PORTION OF SAID UNCROPPED, ELONGATED CAUSTING; SAID CASTING BEING DEVOID OF RARE EARTHS.
Claim 2
Dependent Claim
85 words
AN ELONGATED, UNCROPPED, AS-CAST UNWORKED CASTING COMPOSED OF LEADED STEEL AND COMPRISING: A WEIGHT GREATER THAN ABOUT 1000 POUNDS AND A COMMERCIALLY ACCEPTABLE SURFACE; A LEAD CONTENT GREATER THAN 0.35 WT. PERCENT AND UP TO 0.70 WT. PERCENT; LEAD INCLUSIONS, CONSISTING ESSENTIALLY OF MICROSCOPIC INCLUSIONS COMPRISING ELEMENTAL LEAD, DISTRUBTED THROUGOUT THE LENGTH OF SAID ELONGATED CASTING; SAID ELONGATED CAUSING BEING ESSENTIALLY DEVOID OF MACROSCOPIC LEAD INCLUSIONS THROUGHOUT ITS LENGTH INCLUDING THE BOTTOM PORTION OF SAID UNCROPPED, ELONGATED CAUSTING; SAID CASTING BEING DEVOID OF RARE EARTHS.
Claim 3
Dependent Claim
20 words
An elongated casting as recited in claim 1 and which is essentially devoid of lead oxide inclusions and of aluminum.
Claim 4
Dependent Claim
14 words
An elongated casting as recited in claim 1 wherein said casting is an ingot.
Claim 5
Dependent Claim
16 words
An elongated casting as recited in claim 1 wherein said casting is a continuously cast strand.
Claim 6
Dependent Claim
19 words
An elongated casting as recited in claim 1 wherein said lead content is in the range 0.45-0.50 wt. percent.
Claim 7
Dependent Claim
19 words
An elongated casting as recited in claim 1 wherein said lead content is in the range 0.45-0.60 wt. percent.
Claim 8
Dependent Claim
81 words
An elongated, uncropped, as-cast ingot composed of leaded steel and comprising: a weight greater than about 1,000 pounds and a commercially acceptable surface; a lead content greater than 0.35 wt. percent and up to 0.70 wt. percent; lead inclusions, consisting essentially of microscopic inclusions comprising elemental lead, distributed throughout the length of said ingot; said ingot being essentially devoid of macroscopic lead inclusions throughout its length including the bottom portion of said uncropped ingot; said ingot being devoid of rare earths.
Claim 9
Dependent Claim
81 words
An elongated, uncropped, as-cast ingot composed of leaded steel and comprising: a weight greater than about 1,000 pounds and a commercially acceptable surface; a lead content greater than 0.35 wt. percent and up to 0.70 wt. percent; lead inclusions, consisting essentially of microscopic inclusions comprising elemental lead, distributed throughout the length of said ingot; said ingot being essentially devoid of macroscopic lead inclusions throughout its length including the bottom portion of said uncropped ingot; said ingot being devoid of rare earths.
Claim 10
Dependent Claim
20 words
An uncropped ingot as recited in claim 7 and which is essentially devoid of lead oxide inclusions and of aluminum.
Claim 11
Dependent Claim
19 words
An uncropped ingot as recited in claim 7 wherein said lead content is in the range 0.45-0.50 wt. percent.
Claim 12
Dependent Claim
19 words
An uncropped ingot as recited in claim 7 wherein said lead content is in the range 0.45-0.60 wt. percent.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |