US3642591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro zinc plating solution
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
•
Filing: 1970-03-09
•
Granted: 1972-02-15
•
Expires: 1990-03-09
Abstract
Abstract A cyanide-free zinc plating bath is described. Besides a zinc salt in the usual concentration range and possible brighteners, it comprises a polyhydroxy acid or salt and boric acid and/or borate in a molar ratio of between about 1(zinc):1 1/2 (polyhydroxy):3(boric) and 1:2:4, depending on the zinc content of the solution.
Inventors
- 👤 Cesar Adrianus Boose
- 👤 Maarten Johan Reidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
An aqueous electroplating solution according to claim 1 comprising between 5 and 25 grams per litre zinc, about 2 gram-molecules polyhydroxy carboxylic acid or salt thereof per gram-atom zinc, and about 4 gram-molecules boric acid or borate per gram-atom zinc.
Claim 2
Dependent Claim
40 words
An aqueous electroplating solution according to claim 1 comprising between 25 and 50 grams per litre zinc, about 1.5 gram-molecules polyhydroxy carboxylic acid or salt thereof per gram-atom zinc, and about 3 gram-molecules boric acid or borate per gram-atom zinc.
Claim 3
Dependent Claim
25 words
An aqueous electroplating solution according to claim 1 containing from about 1.8 to 2.2 parts boric acid per part polyhydroxy carboxylic acid or salt thereof.
Claim 4
Dependent Claim
19 words
An aqueous electroplating solution according to claim 1 wherein the polyhydroxy carboxylic acid or salt thereof is sodium gluconate.
Claim 5
Dependent Claim
19 words
An aqueous electroplating solution according to claim 1 wherein the polyhydroxy carboxylic acid or salt thereof is sodium heptonate.
References Cited (Backward Citations)
GB190201688A
Cited
US3298938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |