Patent US3620938A successfully refreshed from Google Patents.
US3620938A
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Method for obtaining a bright zinc coating by electrodeposition and the bath used therefor
Assignee: Stauffer Chemical Co
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Filing: 1968-12-11
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Granted: 1971-11-16
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Expires: 1988-12-11
Abstract
Abstract A brightening composition and a process for electrodepositing of zinc is described herein. The brightening composition is the reaction product of an aromatic aldehyde and an amine of the formula H2NR wherein R is a saturated aliphatic hydroxyl radical having from one to four carbon atoms. In particular, bright deposits are achieved when an amide or substituted amide is intermixed with the reaction product of the aromatic aldehyde and the amine.
Inventors
- 👤 James A Von Pless
- 👤 Richard P Cope Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:14
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22; C25D3/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
28 words
The bath of claim 1, wherein said aromatic aldehyde is at least one member selected from the group consisting of anisic aldehyde, vanillin, salicylic aldehyde and tolyl aldehyde.
Claim 2
Dependent Claim
11 words
The bath of claim 2, wherein said aromatic aldehyde is vanillin.
Claim 3
Dependent Claim
31 words
The bath of claim 1, wherein said amide or substituted amide is at least one member selected from the group consisting of: nicotinamide, N-hexylnicotinamide, N,N-diethylnicotinamide, N-ethylolnicotinamide, N,N-di(2-hydroxypropyl)nicotinamide, isonipecotamide, N-methylisonipecotamide, and N-ethylolisonipecotamide.
Claim 4
Dependent Claim
13 words
The bath of claim 4, wherein said amide or substituted amide is nicotinamide.
Claim 5
Dependent Claim
12 words
The bath of claim 1, wherein polyvinyl alcohol is also present therein.
Claim 6
Dependent Claim
11 words
The bath of claim 1, wherein gelatine is also present therein.
Claim 7
Dependent Claim
15 words
The bath of claim 1, wherein both polyvinyl alcohol and gelatine are also present therein.
Claim 8
Dependent Claim
166 words
In the process of electrodepositing zinc from an aqueous, alkaline zinc cyanide plating bath, the improvement which comprises adding to the bath a brightener composition which comprises a combiNation of: (1) the reaction product of at least one aromatic aldehyde with at least a stoichiometric quantity of at least one alkanolamine having the formula H2NR wherein R is a saturated aliphatic hydroxyl radical containing from one to four carbon atoms and (2) at least one water-soluble amide or substituted amide corresponding to the formula: wherein R1 and R2 can be the same or different and are selected from the group consisting of hydrogen, saturated aliphatic radicals containing from one to six carbon atoms and saturated hydroxyl substituted aliphatic radicals containing from one to six carbon atoms; said reaction product being present in said bath in a concentration of from about 0.02 to 0.3 grams per liter and said amide or substituted amide being present in a concentration of from about 0.0015 to 0.14 grams per liter.
Claim 9
Dependent Claim
28 words
The process of claim 9, wherein said aromatic aldehyde is at least one member selected from the group consisting of anisic aldehyde, vanillin, salicylic aldehyde and tolyl aldehyde.
Claim 10
Dependent Claim
11 words
The process of claim 10, wherein said aromatic aldehyde is vanillin.
Claim 11
Dependent Claim
31 words
The process of claim 9, wherein said amide or substituted amide is at least one member selected from the group consisting of: nicotinamide, N-hexylnicotinamide, N,N-diethylnicotinamide, N-ethylolnicotinamide, N,N-di(2-hydroxypropyl)nicotinanide, isonipecotamide, N-methylisonipecotamide, and N-ethylolisonipecotamide,
Claim 12
Dependent Claim
13 words
The process of claim 9, wherein said amide or substituted amide is nicotinamide.
Claim 13
Dependent Claim
14 words
The process of claim 9, wherein polyvinyl alcohol is also present in said bath.
Claim 14
Dependent Claim
13 words
The process of claim 9, wherein gelatine is also present in said bath.
Claim 15
Dependent Claim
17 words
The process of claim 9, wherein both polyvinyl alcohol and gelatine are also present in said bath.
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |