US3990955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of hard nickel
Assignee: Huntington Alloys Corp
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Filing: 1974-11-29
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Granted: 1976-11-09
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Expires: 1994-11-29
Abstract
Abstract Sulfur-free hard nickel in thicknesses in excess of about 50 microns is electrodeposited from nickel plating baths containing 1 to about 8 grams per liter (gpl) of aromatic amide.
Inventors
- 👤 Aloys J. Dill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/12; C25D3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A process of nickel electrodeposition comprising electrolyzing an aqueous nickel plating bath containing in addition to nickel salt, about 0.5 to about 8 grams per liter of an organic, saturated, hydrolysis resistant sulfur-free aromatic, carboxylic acid amide at a cathode current density of about 1.5 to about 50 amperes per square decimeter and at a temperature in the range of about 30° to about 70° C for a time sufficient to form a hard deposit at least about 100 microns thick.
Claim 2
Dependent Claim
81 words
A process of nickel electrodeposition comprising electrolyzing an aqueous nickel plating bath containing in addition to nickel salt, about 0.5 to about 8 grams per liter of an organic, saturated, hydrolysis resistant sulfur-free aromatic, carboxylic acid amide at a cathode current density of about 1.5 to about 50 amperes per square decimeter and at a temperature in the range of about 30° to about 70° C for a time sufficient to form a hard deposit at least about 100 microns thick.
Claim 3
Dependent Claim
19 words
A process as in claim 1 wherein the bath contains one or more of benzamide, phthalamide or hippuric acid.
Claim 4
Dependent Claim
29 words
A process as in claim 1 wherein the bath contains nickel principally as the sulfate or sulphamate and is maintained at a temperature of up to about 60° C.
Claim 5
Dependent Claim
83 words
A process of nickel electrodeposition comprising electrolyzing an aqueous nickel plating bath containing in addition to nickel salt selected from the group consisting of nickel sulfate and nickel sulphamate about 1.5 to about 3 grams per liter of hippuric acid at a cathode current density of about 0.5 to about 5.0 amperes per square decimeter and at a temperature in the range of about 30° to about 60° C for a time sufficient to form a hard deposit at least 50 microns thick.
Claim 6
Dependent Claim
83 words
A process of nickel electrodeposition comprising electrolyzing an aqueous nickel plating bath containing in addition to nickel salt selected from the group consisting of nickel sulfate and nickel sulphamate about 1.5 to about 3 grams per liter of hippuric acid at a cathode current density of about 0.5 to about 5.0 amperes per square decimeter and at a temperature in the range of about 30° to about 60° C for a time sufficient to form a hard deposit at least 50 microns thick.
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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |