US3634145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Case-hardened metals
Assignee: PELTZ NELSON
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Filing: 1968-12-09
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Granted: 1972-01-11
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Expires: 1988-12-09
Abstract
Abstract A process of boronizing a metal article is described which comprises immersing the selected metal article in a fused bath composed of at least one alkali metal halide or alkaline earth metal halide and a boron slat of the empirical formula MxByFz wherein M is an alkali metal, and the ratio of x:y:z is 1:0.4 to 2.0:0.5 to 2.5 with y being preferably above 1 and z is preferably below 1.5, the fused bath being maintained at a temperature between 1,200* to 1,750* F. for a sufficient duration to impregnate the metal with boron. There is also described novel boron products, their process of manufacture and salt baths containing such boron products. The process produces extremely hard, uniform, adherent and corrosion resistant boride casing on metals such as carbon and alloy steels.
Inventors
- 👤 Oris T Homan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/40; C23C8/42; C25; C25D; C25D3/00; C25D3/66
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
17 words
A product according to claim 1 wherein the ratio of x:y:z is 1:1 to 2:0.5 to 1.5.
Claim 2
Dependent Claim
12 words
A product according to claim 1 wherein the alkali metal is sodium.
Claim 3
Dependent Claim
93 words
A fused salt bath composition comprising (a) a product of the empirical formula MxByFz wherein M is an alkali metal, B is boron, F is the fluoride ion and in which the ratio of x:y:z is 1:0.4 to 2:0.5 to 2.5 and (b) at least one halide salt selected from the class consisting of alkali metal halides and alkali earth halides, said halide salt being the predominant salt in said bath and said product defined in (a) comprising about 10 to about 35 percent by weight of said halide salt in said bath.
Claim 4
Dependent Claim
17 words
A salt bath according to claim 4 wherein said halide salt comprises two different alkali metal halides.
Claim 5
Dependent Claim
18 words
A salt bath according to claim 5 wherein the ratio of x:y:z is 1:1 to 2:0.5 to 1.5.
Claim 6
Dependent Claim
16 words
A salt bath according to claim 5 wherein saiD alkali metal halides are alkali metal chlorides.
Claim 7
Dependent Claim
33 words
A salt bath according to claim 5 wherein the cation portion of one of said alkali metal halides is the same as the cation portion of said product of the empirical formula MxByFz.
Claim 8
Dependent Claim
13 words
A salt bath according to claim 8 wherein said cation portion is sodium.
Claim 9
Dependent Claim
26 words
A salt bath according to claim 4 wherein said product defined in (a) comprises about 20 to 35 percent by weight of said salt bath composition.
Claim 10
Dependent Claim
18 words
A salt bath according to claim 10 wherein said alkali metal chlorides are sodium chloride and lithium chloride.
Claim 11
Dependent Claim
18 words
A salt bath according to claim 10 wherein said alkali metal chlorides are potassium chloride and sodium chloride.
Claim 12
Dependent Claim
24 words
A salt bath according to claim 10 wherein said alkali metal halides comprise at least 50 percent by weight of said salt bath composition.
Claim 13
Dependent Claim
68 words
A fused salt bath composition comprising (a) a product of the empirical formula MxByFz wherein M is an alkali metal, B is boron, F is the fluoride ion and the ratio of x:y:z is 1:0.4 to 2:0.5 to 2.5 and (b) at least two alkali metal chlorides, said product of the empirical formula MxByFz comprising about 20 to about 35 percent by weight of said salt bath composition.
Claim 14
Dependent Claim
19 words
A fused salt bath according to claim 14 wherein said alkali metal chlorides are sodium chloride and lithium chloride.
Claim 15
Dependent Claim
12 words
A fused salt bath according to claim 15 wherein M is sodium.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |