US4533441A
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US
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Practical amorphous iron electroform and method for achieving same
Assignee: Burlington Industries Inc
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Filing: 1984-03-30
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Granted: 1985-08-06
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Expires: 2004-03-30
Abstract
Abstract Amorphous iron-phosphorus electroforms may be fabricated electrolytically from a plating bath which contains at least one compound from which iron can be electrolytically deposited, at least one compound which serves as a source of phosphorus such as hypophosphorous acid, and at least one compound selected from the group consisting of glycine, beta -alanine, DL-alanine, and succinic acid. The electroforms can be fabricated over a very wide current density range. The stress in the plating can advantageously be further lowered by including in the bath at least one compound which serves as a source of sulfur, such as naphthalene trisulfonic acid or ferrous sulfate.
Inventors
- 👤 Rodger L. Gamblin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:31
CPC Classifications
C; C25; C25D; C25D1/00; C25D3/00; C25D3/02; C25D3/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A method of fabricating amorphous iron-phosphorus electroforms, comprising electroforming on a conductive substrate in a bath containing: at least one compound from which iron can be electrolytically deposited, at least one compound from which phosphorus can be electrolytically deposited, selected from the group consisting of hypophosphorous acid and alkali metal hypophosphite salts in an amount sufficient to render said iron amorphous, and at least one complexing agent selected from the group consisting of glycine, β-alanine, DL-alanine and succinic acid.
Claim 2
Independent Claim
79 words
A method of fabricating amorphous iron-phosphorus electroforms, comprising electroforming on a conductive substrate in a bath containing: at least one compound from which iron can be electrolytically deposited, at least one compound from which phosphorus can be electrolytically deposited, selected from the group consisting of hypophosphorous acid and alkali metal hypophosphite salts in an amount sufficient to render said iron amorphous, and at least one complexing agent selected from the group consisting of glycine, β-alanine, DL-alanine and succinic acid.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said electroform is plated at a current density between about 2 and about 400 mA/cm 2 .
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said electroform is plated at a pH between about 2.5 and about 3.5.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein said complexing agent is present in said bath at a level between about 0.05 and about 0.75 molar.
Claim 6
Dependent Claim
37 words
The method of claim 1, wherein said bath further includes a source of sulfur in the form of at least one compound selected from the group consisting of naphthalene trisulfonic acid, ferrous sulfate, sulfamic acid, and saccharin.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein said iron compound is selected from the group consisting of ferrous sulfate and ferrous chloride.
Claim 8
Dependent Claim
73 words
An amorphous iron-phosphorus electroform produced by electroforming iron-phosphorus on a conductive substrate using a bath containing: at least one compound from which iron can be electrolytically deposited, at least one source of phosphorus selected from the group consisting of hypophosphorous acid and alkali metal hypophosphite salts in an amount sufficient to render said iron amorphous, and at least one complexing agent selected from the group consisting of glycine, β-alanine, DL-alanine and succinic acid.
Claim 9
Dependent Claim
73 words
An amorphous iron-phosphorus electroform produced by electroforming iron-phosphorus on a conductive substrate using a bath containing: at least one compound from which iron can be electrolytically deposited, at least one source of phosphorus selected from the group consisting of hypophosphorous acid and alkali metal hypophosphite salts in an amount sufficient to render said iron amorphous, and at least one complexing agent selected from the group consisting of glycine, β-alanine, DL-alanine and succinic acid.
Claim 10
Dependent Claim
23 words
The electroform of claim 7 wherein said electroform is plated at a current density between about 2 and about 400 mA/cm 2 .
Claim 11
Dependent Claim
19 words
The electroform of claim 7 wherein said electroform is plated at a pH between about 2.5 and about 3.5.
Claim 12
Dependent Claim
24 words
The electroform of claim 7 wherein said complexing agent is present in said bath at a level between about 0.05 and about 0.75 molar.
Claim 13
Dependent Claim
37 words
The electroform of claim 7, wherein said bath further includes a source of sulfur in the form of at least one compound selected from the group consisting of naphthalene trisulfonic acid, ferrous sulfate, sulfamic acid, and saccharin.
Claim 14
Dependent Claim
21 words
The electroform of claim 7, wherein said iron compound is selected from the group consisting of ferrous sulfate and ferrous chloride.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |