US4097286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of depositing a metal on a surface
Assignee: AT&T Inc
•
Filing: 1977-01-31
•
Granted: 1978-06-27
•
Expires: 1997-01-31
Abstract
Abstract A method of depositing a metal on a dielectric surface is disclosed. The method comprises treating the surface with a stable hydrosol obtained by mixing and heating together in an acidic aqueous medium (1) a salt of a noble metal with (2) an organic compound containing at least two oxygen atoms selected from (a) an organic carbonate having a structural formula of ##STR1## where R = H, an alkyl radical, (b) ethylene glycol and (c) 1,3 dioxane. The treated surface is then exposed to a suitable electroless metal deposition solution to catalytically deposit an electroless metal deposit thereon.
Inventors
- 👤 Robert Vincent Dafter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:58
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; Y; Y10; Y10S; Y10S205/00; Y10S205/924; Y10S205/926
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A method of preparing an electroless metal deposition catalyst which comprises: combining in an acidic aqueous medium a salt of a noble metal and an organic compound containing at least two oxygen atoms, selected from the group consisting of (a) an organic carbonate having a structural formula of ##STR4## where R is a member selected from the group consisting of an alkyl radical and a hydrogen atom, (b) ethylene glycol, and (c) 1,3 dioxane, to form a mixture; and heating said mixture having a pH of from 0.3 ranging up to a value of less than 4.0, and wherein said organic compound is present in an amount of at least 50 volume percent to form a stable hydrosol capable of participating in an electroless metal deposition catalysis.
Claim 2
Independent Claim
127 words
A method of preparing an electroless metal deposition catalyst which comprises: combining in an acidic aqueous medium a salt of a noble metal and an organic compound containing at least two oxygen atoms, selected from the group consisting of (a) an organic carbonate having a structural formula of ##STR4## where R is a member selected from the group consisting of an alkyl radical and a hydrogen atom, (b) ethylene glycol, and (c) 1,3 dioxane, to form a mixture; and heating said mixture having a pH of from 0.3 ranging up to a value of less than 4.0, and wherein said organic compound is present in an amount of at least 50 volume percent to form a stable hydrosol capable of participating in an electroless metal deposition catalysis.
Claim 3
Dependent Claim
16 words
The method as defined in claim 1 wherein said organic carbonate in (a) comprises ethylene carbonate.
Claim 4
Dependent Claim
16 words
The method as defined in claim 1 wherein said organic carbonate in (a) comprises propylene carbonate.
Claim 5
Dependent Claim
37 words
The method as defined in claim 1 wherein said noble metal salt comprises a salt of palladium present in an amount of 0.025 weight percent ranging up to an amount of 0.075 weight percent of said mixture.
Claim 6
Dependent Claim
112 words
An electroless metal deposition catalyst comprising a hydrosol obtained by mixing together, in an acidic aqueous medium, a salt of a noble metal and an organic compound, capable of reacting therewith to form said hydrosol, selected from the group consisting of (a) an organic carbonate having a structural formula of ##STR5## where R is a member selected from the group consisting of an alkyl radical and a hydrogen atom, (b) ethylene glycol and (c) 1,3 dioxane, and heating the resultant mixture having a pH of from 0.3 ranging up to a value of less than 4.0, and wherein said organic compound is present in an amount of at least 50 volume percent.
Claim 7
Dependent Claim
112 words
An electroless metal deposition catalyst comprising a hydrosol obtained by mixing together, in an acidic aqueous medium, a salt of a noble metal and an organic compound, capable of reacting therewith to form said hydrosol, selected from the group consisting of (a) an organic carbonate having a structural formula of ##STR5## where R is a member selected from the group consisting of an alkyl radical and a hydrogen atom, (b) ethylene glycol and (c) 1,3 dioxane, and heating the resultant mixture having a pH of from 0.3 ranging up to a value of less than 4.0, and wherein said organic compound is present in an amount of at least 50 volume percent.
Claim 8
Dependent Claim
11 words
The catalyst as defined in claim 5 wherein R is H.
Claim 9
Dependent Claim
13 words
The catalyst as defined in claim 5 wherein R is CH 3 .
Claim 10
Dependent Claim
17 words
The catalyst as defined in claim 5 wherein said noble metal salt comprises a salt of palladium.
References Cited (Backward Citations)
US3140252A
Cited
US3470019A
Cited
GB1146530A
Cited
JPS4329242Y1
Cited
US3597266A
Cited
US3671291A
Cited
US3698919A
Cited
US3817774A
Cited
US3650913A
Cited
US3622367A
Cited
US3704156A
Cited
US3770785A
Cited
US3769061A
Cited
US3871889A
Cited
US3963590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |