US4539053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pack composition for carburosiliconizing ferrous substrates
Assignee: Dresser Industries Inc
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Filing: 1984-08-27
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Granted: 1985-09-03
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Expires: 2004-08-27
Abstract
Abstract A pack composition is disclosed for case hardening a ferrous metal to initially diffuse boron into the surface thereof and subsequently diffuse boron and silicon into the surface thereof. The pack composition comprises an amorphous boron, a silicon material, an alkyli earth, and a carbon bearing compound with the last named compound including a barium carbonate, a calcium carbonate and a hardwood charcoal and coke mixture.
Inventors
- 👤 William L. Aves, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
C; C23; C23C; C23C12/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A pack composition for treating a ferrous metal to initially diffuse carbon into the surface thereof and subsequently diffuse boron and silicon consisting essentially of: (a) between about 5% and 20% by weight amorphous boron; (b) between about 2% and 10% by weight silicon material; (c) between about 2% and 15% by weight alkali earth; and (d) between about 70% and 90% by weight carbon bearing compound, said carbon bearing compound consisting essentially of (1) between about 5% and 45% by weight barium carbonate; (2) between about 5% and 20% weight calcium carbonate; (3) between about 50% and 90% by weight hardwood charcoal and coke mixture, said hardwood charcoal and coke mixture comprising: (i) between about 70% and 90% by weight hardwood charcoal; and (ii) between about 5% and 20% by weight coke.
Claim 2
Dependent Claim
133 words
A pack composition for treating a ferrous metal to initially diffuse carbon into the surface thereof and subsequently diffuse boron and silicon consisting essentially of: (a) between about 5% and 20% by weight amorphous boron; (b) between about 2% and 10% by weight silicon material; (c) between about 2% and 15% by weight alkali earth; and (d) between about 70% and 90% by weight carbon bearing compound, said carbon bearing compound consisting essentially of (1) between about 5% and 45% by weight barium carbonate; (2) between about 5% and 20% weight calcium carbonate; (3) between about 50% and 90% by weight hardwood charcoal and coke mixture, said hardwood charcoal and coke mixture comprising: (i) between about 70% and 90% by weight hardwood charcoal; and (ii) between about 5% and 20% by weight coke.
Claim 3
Dependent Claim
13 words
The pack composition of claim 1 wherein said silicon material comprises silicon powder.
Claim 4
Dependent Claim
13 words
The pack composition of claim 1 wherein said silicon material comprises silicon carbide.
Claim 5
Dependent Claim
13 words
The pack composition of claim 1 wherein said alkali earth comprises sodium fluorosilicide.
Claim 6
Dependent Claim
13 words
The pack composition of claim 1 wherein said alkali earth comprises potassium fluoride.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |