Patent US3902907A successfully refreshed from Google Patents.
US3902907A
Expired / Lapsed
US
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System for electroless plating of copper and composition
Assignee: Individual
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Filing: 1973-08-17
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Granted: 1975-09-02
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Expires: 1993-08-17
Abstract
Abstract ng agent for cupric ion, a reducing agent, an alkaline compound for adjusting pH, the improvement comprising the addition of a stabilizer consisting of an organic thiol compound selected from the group of organic acids having the characteristics of chemical tautomerism in the carboxylic group selected from the group consisting of dithiolterephthalic acid, thiolbenzoic acid or thiolacetic acid.
Inventors
- 👤 Kazutaka Kishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:36
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23C18/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
AN ELECTROLESS COPPER PLANTING SOLUTION WHICH COMPRISES A WATER SOLUBLE COPPER SALT, A COMPLEXING AGENT FOR CUPRIC ION, A REDUCING AGENT, AN ALKALINE COMPOUND FOR ADJUSTING PH, THE IMPROVING COMPRISING THE ADDITION OF A STABLIZER CONSISTING OF AN ORGANIC THIOL COMPOUND SELECTED FROM THE GROUP OF ORGANIC ACIDS HAVING THE CHARACTERISTICS OF CHEMICAL TAUTOMERISM IN THE CARBOXYLIC GROUP SELECTED FROM THE GROUP CONSISTING OF DITHIOLTEREPHTALIC ACID, THIOLBENZOIC ACID OR THIOLACETIC ACID.
Claim 2
Dependent Claim
71 words
AN ELECTROLESS COPPER PLANTING SOLUTION WHICH COMPRISES A WATER SOLUBLE COPPER SALT, A COMPLEXING AGENT FOR CUPRIC ION, A REDUCING AGENT, AN ALKALINE COMPOUND FOR ADJUSTING PH, THE IMPROVING COMPRISING THE ADDITION OF A STABLIZER CONSISTING OF AN ORGANIC THIOL COMPOUND SELECTED FROM THE GROUP OF ORGANIC ACIDS HAVING THE CHARACTERISTICS OF CHEMICAL TAUTOMERISM IN THE CARBOXYLIC GROUP SELECTED FROM THE GROUP CONSISTING OF DITHIOLTEREPHTALIC ACID, THIOLBENZOIC ACID OR THIOLACETIC ACID.
Claim 3
Dependent Claim
29 words
The composition of claim 1, in which the stabilizer is present in the range of 0.10 to 5.0 parts per million based upon the weight of the plating solution.
References Cited (Backward Citations)
US3257215A
Cited
US3485643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |