US4430171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroplating baths for nickel, iron, cobalt and alloys thereof
Assignee: M&T HARSHAW
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Filing: 1981-08-24
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Granted: 1984-02-07
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Expires: 2001-08-24
Abstract
Abstract An aqueous electroplating bath for nickel, cobalt, nickel-cobalt, nickel-iron, cobalt-iron or nickel-cobalt-iron is described which contains, as a brightening agent, a quaternary amine sulfobetaine of the formula ##STR1## wherein N + is a heterocyclic tertiary amine group, R is a halogen or lower alkyl group, R' is a hydrogen, lower alkyl or R"C(O)--group R" is a lower alkyl group and a is 0-5. These brighteners may be prepared by the reaction of a heterocyclic tertiary amine with an alkali metal halohydrin sulfonate.
Inventors
- 👤 Kenneth W. Lemke
- 👤 Maynard W. McNeil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/12; C25D3/14; C25D3/18; C25D3/56; C25D3/562
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A plating bath for the electrodeposition of metal comprising an aqueous solution of at least one metal salt selected from salts of nickel, iron and cobalt, characterized by the presence of a brightening agent of the formula ##STR3## wherein N + is a heterocyclic tertiary amine group, R is a halogen or lower alkyl group, R' is hydrogen, lower alkyl or a R"C(O)--group, R" is a lower alkyl group and a is 0-5.
Claim 2
Dependent Claim
73 words
A plating bath for the electrodeposition of metal comprising an aqueous solution of at least one metal salt selected from salts of nickel, iron and cobalt, characterized by the presence of a brightening agent of the formula ##STR3## wherein N + is a heterocyclic tertiary amine group, R is a halogen or lower alkyl group, R' is hydrogen, lower alkyl or a R"C(O)--group, R" is a lower alkyl group and a is 0-5.
Claim 3
Dependent Claim
18 words
The plating bath in accordance with claim 1 wherein said N + is an aromatic heterocyclic amine group.
Claim 4
Dependent Claim
25 words
The plating bath in accordance with claim 2 wherein said brightening agent is selected from the group consisting of 1-pyridinium-2-hydroxypropane-3-sulfobetaine, 1-quinolinium-2-hydroxypropane-3-sulfobetaine, 1-pyridinium-2-acetoxypropane-3-sulfobetaine and mixtures thereof.
Claim 5
Dependent Claim
12 words
The plating bath in accordance with claim 1 wherein R' is R"C(O)--group.
Claim 6
Dependent Claim
12 words
The plating bath in accordance with claim 1 wherein R' is hydrogen.
Claim 7
Dependent Claim
32 words
The plating bath in accordance with claim 5 wherein said brightening agent is a component of the product of the reaction of a heterocyclic tertiary amine and an alkali metal halohydrin sulfonate.
Claim 8
Dependent Claim
16 words
The plating bath in accordance with claim 6 which contains the entire product of said reaction.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |