US3841881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electroless deposition of metal using improved colloidal catalyzing solution
Assignee: RCA Corp
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Filing: 1972-09-13
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Granted: 1974-10-15
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Expires: 1992-09-13
Abstract
Abstract A colloidal solution of a catalytic metal is prepared by admixing an acid-soluble salt of the metal, hydrochloric acid, a soluble stannous salt present in excess of the amount necessary to reduce the metal salt to colloidal metal, and a quantity of stannic chloride that has been separately aged. A substrate surface upon which metal is to be deposited is treated with the catalytic colloidal solution. The catalyzed surface is then subjected to an electroless plating bath.
Inventors
- 👤 N Feldstein
- 👤 T Lancsek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:09
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A COLLODIAL CATALYTIC SOLUTION FOR CATALYZING A SUBSTRATE PRIOR TO ELECTROLESS METAL DEPOSITION THEREON, SAID CATALYST COMPRISING THE SOLUTION RESULTING FROM THE ADMIXTURE OF AN ACID SOLUBLE SALT OF A CATALYTIC METAL SELCTED FROM THE GROUP CONSISTING OF GOLD, AND THE PLATINUM FAMILY OF METALS, HYDROCHLORIC ACID, A STANNOUS SALT SOLUBLE IN AQUEOUS SOLUTION, SAID STANNOUS SALT BEING IN EXCESS OF THE AMOUNT NECESSARY TO REDUCE SAID METAL SALT TO COLLOIDAL METAL, AND A QUANTITY OF A SOLUTION OF STANNIC CHLORIDE WHICH HAS BEEN SEPARATELY AGED FOR THE EQUIVALENT OF AT LEAST 4 DAYS AT ROOM TEMPRATURE PRIOR TO ADMIXTURE, SAID STANNOUS SALT SOLUBLE IN AQUEOUS SOLUTION, SAI CENTRATION OF ABOUT 0.01 TO 0.5 MOLAR IN SAID CATALYTIC SOLUTION
Claim 2
Dependent Claim
119 words
A COLLODIAL CATALYTIC SOLUTION FOR CATALYZING A SUBSTRATE PRIOR TO ELECTROLESS METAL DEPOSITION THEREON, SAID CATALYST COMPRISING THE SOLUTION RESULTING FROM THE ADMIXTURE OF AN ACID SOLUBLE SALT OF A CATALYTIC METAL SELCTED FROM THE GROUP CONSISTING OF GOLD, AND THE PLATINUM FAMILY OF METALS, HYDROCHLORIC ACID, A STANNOUS SALT SOLUBLE IN AQUEOUS SOLUTION, SAID STANNOUS SALT BEING IN EXCESS OF THE AMOUNT NECESSARY TO REDUCE SAID METAL SALT TO COLLOIDAL METAL, AND A QUANTITY OF A SOLUTION OF STANNIC CHLORIDE WHICH HAS BEEN SEPARATELY AGED FOR THE EQUIVALENT OF AT LEAST 4 DAYS AT ROOM TEMPRATURE PRIOR TO ADMIXTURE, SAID STANNOUS SALT SOLUBLE IN AQUEOUS SOLUTION, SAI CENTRATION OF ABOUT 0.01 TO 0.5 MOLAR IN SAID CATALYTIC SOLUTION
Claim 3
Dependent Claim
13 words
A solution according to claim 1 in which said catalytic metal is palladium.
Claim 4
Dependent Claim
13 words
A solution according to claim 1 in which said catalytic metal is gold.
Claim 5
Dependent Claim
13 words
A solution according to claim 1 in which said catalytic metal is platinum.
Claim 6
Independent Claim
116 words
The method of making a colloidal catalyst solution for application to a substrate surface prior to electroless metal deposition thereon, comprising admixing an acid soluble salt of a catalytic metal selected from the group consisting of gold, and the platinum family of metals, hydrochloric acid, a stannous salt soluble in aqueous solution, said stannous salt being in excess of the amount necessary to reduce said metal salt to colloidal metal, and a quantity of stannic chloride solution which has been separately aged for a period which is the equivalent of at least 4 days at room temperature and said stannic compound being present in a concentration of about 0.01 to 0.5 molar in said catalyst solution.
Claim 7
Independent Claim
116 words
The method of making a colloidal catalyst solution for application to a substrate surface prior to electroless metal deposition thereon, comprising admixing an acid soluble salt of a catalytic metal selected from the group consisting of gold, and the platinum family of metals, hydrochloric acid, a stannous salt soluble in aqueous solution, said stannous salt being in excess of the amount necessary to reduce said metal salt to colloidal metal, and a quantity of stannic chloride solution which has been separately aged for a period which is the equivalent of at least 4 days at room temperature and said stannic compound being present in a concentration of about 0.01 to 0.5 molar in said catalyst solution.
Claim 8
Dependent Claim
12 words
The method of claim 1 in which said catalytic metal is palladium.
Claim 9
Dependent Claim
12 words
The method of claim 5 in which said catalytic metal is gold.
Claim 10
Dependent Claim
12 words
The method of claim 5 in which said catalytic metal is platinum.
References Cited (Backward Citations)
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |