US3878069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid zinc galvanic bath
Assignee: TODT HANS#GUNTHER
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Filing: 1973-05-31
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Granted: 1975-04-15
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Expires: 1993-05-31
Abstract
Abstract A novel aqueous acid galvanic zinc plating bath contains luster formers, and as its active ingredients a soluble zinc salt and an amount of a polycondensation product of formaldehyde and naphthalene sulfonic acid effective to impart ductility and malleability to the zinc coating, but free from complexing agents so that said bath upon dilution and neutralization with alkali is capable of retaining not more than about 3 mg per liter of zinc ion, expressed as zinc hydroxide.
Inventors
- 👤 Hans-Gunther Todt
- 👤 Gunter Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:45
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
AN AQUEOUS ACID GALVANIC ZINC ELECTROPLATING BATH CONTAINING (A) A WATER-SOLUBLE ZINC SALT IN A CONCENTRATION BETWEEN ABOUT 30 AND ABOUT 200 G PER LITER EXPRESSED AS ZINC CHLORIDE, (B) A WATER-SOLUBLE AMMONIUM SALT IN A CONCENTRATION SUFFICIENT TO IMPROVE THE BATH CONDUCTIVITY BUT INSUFFICIENT TO INTERFERE WITH SUUBSEQUENT ZINC ION REMOVAL BY DILUTION AND ALKALINE PRECIPITATION, (C) A WATER-SOLUBLE CONDENSATION PRODUCT OF FORMALDEHYDE AND AT LEAST TWO NAPHTHALENE SULFONIC ACIDS LINKED BY METHYLENE BRIDGES AND WHICH CONTAIN FROM 1 TO 3 SULFONIC ACID GROUPS IN AN AMOUNT EFFECTIVE TO IMPART DULTILITY AND MALLEABILITY TO THE ZINC COATING PRODUCED FROM SAID BATH, AND (D) A LUSTER FORMER SELECTED FROM THE GROUP CONSISTING OF POLYMERIC ORGANIC GLYCOLS AND GLYCOL ETHERS, AND ORGANIC CARBONYL COMPOUNDS IN AN AMOUNT EFFECTIVE TO IMPART LUSTER TO THE ZINC COATING PRODUCED FROM SAID BATH, SAID BATH CONTAINING NO COMPLEXING AGENT FOR ZINC AND BEING CAPABLE UPON DILUTION WITH WATER IN A RATIO ABOUT 500:1 AND NEUTRALIZATION WITH ALKALI OF PRECIPITATING THE ZINC ION PRESENT TO SUCH AN EXTENT SUCH THAT NOT MORE THAN ABOUT 3 MG PER LITER OF ZINC ION IS RETAINED IN SAID BATH.
Claim 2
Dependent Claim
190 words
AN AQUEOUS ACID GALVANIC ZINC ELECTROPLATING BATH CONTAINING (A) A WATER-SOLUBLE ZINC SALT IN A CONCENTRATION BETWEEN ABOUT 30 AND ABOUT 200 G PER LITER EXPRESSED AS ZINC CHLORIDE, (B) A WATER-SOLUBLE AMMONIUM SALT IN A CONCENTRATION SUFFICIENT TO IMPROVE THE BATH CONDUCTIVITY BUT INSUFFICIENT TO INTERFERE WITH SUUBSEQUENT ZINC ION REMOVAL BY DILUTION AND ALKALINE PRECIPITATION, (C) A WATER-SOLUBLE CONDENSATION PRODUCT OF FORMALDEHYDE AND AT LEAST TWO NAPHTHALENE SULFONIC ACIDS LINKED BY METHYLENE BRIDGES AND WHICH CONTAIN FROM 1 TO 3 SULFONIC ACID GROUPS IN AN AMOUNT EFFECTIVE TO IMPART DULTILITY AND MALLEABILITY TO THE ZINC COATING PRODUCED FROM SAID BATH, AND (D) A LUSTER FORMER SELECTED FROM THE GROUP CONSISTING OF POLYMERIC ORGANIC GLYCOLS AND GLYCOL ETHERS, AND ORGANIC CARBONYL COMPOUNDS IN AN AMOUNT EFFECTIVE TO IMPART LUSTER TO THE ZINC COATING PRODUCED FROM SAID BATH, SAID BATH CONTAINING NO COMPLEXING AGENT FOR ZINC AND BEING CAPABLE UPON DILUTION WITH WATER IN A RATIO ABOUT 500:1 AND NEUTRALIZATION WITH ALKALI OF PRECIPITATING THE ZINC ION PRESENT TO SUCH AN EXTENT SUCH THAT NOT MORE THAN ABOUT 3 MG PER LITER OF ZINC ION IS RETAINED IN SAID BATH.
Claim 3
Dependent Claim
18 words
The electroplating bath of claim 1 in which the pH range is between about 3 and about 6.
Claim 4
Dependent Claim
25 words
The electroplating bath of claim 1 in which the amount of said polycondensation product (c) is between about 0.2 and about 25 grams per liter.
References Cited (Backward Citations)
US3537959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |