US4003425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for obtaining white cast iron
Assignee: British Cast Iron Research Association
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Filing: 1976-02-10
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Granted: 1977-01-18
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Expires: 1996-02-10
Abstract
Abstract In an iron molding process and in a mold for carrying out the process, in which the mold is at least locally coated with tellurium or bismuth to promote the production of a white iron structure there is included in the coating a water-bearing substance in which the water is loosely chemically combined tightly enough so that it withstands the heat involved in drying of the mold but is liberated on contact with the molten iron.
Inventors
- 👤 William Robert Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:21
CPC Classifications
B; B22; B22C; B22C3/00; B22D; B22D27/00; B22D27/18; B22D27/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A method of making an iron casting containing at least a region of white iron comprising pouring molten iron into a mold having an internal surface of which at least a portion has first been coated with a material containing a white-iron-promoting material selected from the class consisting of tellurium and bismuth and compounds thereof and containing in addition a substance which contains water in a loosely chemically combined form, said water being bound sufficiently tightly to withstand drying of said mold but being liberated at the temperature of the molten iron.
Claim 2
Independent Claim
92 words
A method of making an iron casting containing at least a region of white iron comprising pouring molten iron into a mold having an internal surface of which at least a portion has first been coated with a material containing a white-iron-promoting material selected from the class consisting of tellurium and bismuth and compounds thereof and containing in addition a substance which contains water in a loosely chemically combined form, said water being bound sufficiently tightly to withstand drying of said mold but being liberated at the temperature of the molten iron.
Claim 3
Dependent Claim
25 words
The method set forth in claim 1 wherein said material and said substance are mixed together before being applied to said mold as a mixture.
Claim 4
Dependent Claim
23 words
The method set forth in claim 1 wherein said material is applied to the internal surface of said mold, followed by said substance.
Claim 5
Dependent Claim
14 words
The method set forth in claim 1 wherein said substance is a hydrated salt.
Claim 6
Dependent Claim
15 words
The method set forth in claim 4 wherein said substance is a hydrated sodium carbonate.
Claim 7
Dependent Claim
15 words
The method set forth in claim 4 wherein said substance is a hydrated calcium chloride.
Claim 8
Dependent Claim
95 words
A mold for making an iron casting containing at least a region of white iron, said mold comprising a body defining a mold cavity, at least a portion of the surface of said cavity being coated with a material containing a white-iron-promoting material selected from the class consisting of tellurium and bismuth and compounds thereof and containing in addition a substance which contains water in chemically loosely combined form, said water being bound sufficiently tightly to withstand drying of said mold but being such as to be liberated at the temperature of the molten iron.
Claim 9
Dependent Claim
95 words
A mold for making an iron casting containing at least a region of white iron, said mold comprising a body defining a mold cavity, at least a portion of the surface of said cavity being coated with a material containing a white-iron-promoting material selected from the class consisting of tellurium and bismuth and compounds thereof and containing in addition a substance which contains water in chemically loosely combined form, said water being bound sufficiently tightly to withstand drying of said mold but being such as to be liberated at the temperature of the molten iron.
Claim 10
Dependent Claim
14 words
The mold set forth in claim 7 wherein said substance is a hydrated salt.
Claim 11
Dependent Claim
15 words
The mold set forth in claim 8 wherein said substance is a hydrated sodium carbonate.
Claim 12
Dependent Claim
15 words
The mold set forth in claim 7 wherein said substance is a hydrated calcium chloride.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |