Patent US4073981A successfully refreshed from Google Patents.
US4073981A
Expired / Lapsed
US
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Method of selectively depositing metal on a surface
Assignee: AT&T Inc
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Filing: 1977-03-11
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Granted: 1978-02-14
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Expires: 1997-03-11
Abstract
Abstract A method is disclosed for selectively depositing a metal on a surface of a substrate capable of retaining thereon a colloidal activating metal for electroless metal deposition. The method comprises coating a portion of the surface with a copolymer of maleic anhydride and a vinyl monomer, wherein the copolymer coat is selectively incapable of retaining thereon the colloidal activating metal species, to delineate an uncoated surface pattern which is capable of retaining the colloidal activating metal species thereon. The selectively coated surface is treated with a sol comprising the colloidal activating metal species to deposit the metal species only on the uncoated surface pattern. Subsequently, the colloidal species deposited pattern may be exposed to an electroless metal deposition solution to deposit a metal thereon.
Inventors
- 👤 William J. Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:26
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/184; C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1603; C23C18/1605; H05K2203/00; H05K2203/14; H05K2203/1415; H05K3/0073; H05K3/0076
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
108 words
A method of selectively depositing a metal on a surface of a substrate capable of retaining thereon a colloidal activating metal species for electroless metal deposition, which comprises: (a) selectively coating the substrate surface by coating a portion thereof with a copolymer coat of maleic anhydride and a vinyl monomer, said coat being selectively incapable of retaining thereon said colloidal activating metal species, to delineate an uncoated surface pattern capable of retaining the colloidal activating metal species thereon; and thereafter (b) treating said selectively coated surface with a sol comprising said colloidal activating metal species to deposit said colloidal activating metal species only on said uncoated surface pattern.
Claim 2
Independent Claim
108 words
A method of selectively depositing a metal on a surface of a substrate capable of retaining thereon a colloidal activating metal species for electroless metal deposition, which comprises: (a) selectively coating the substrate surface by coating a portion thereof with a copolymer coat of maleic anhydride and a vinyl monomer, said coat being selectively incapable of retaining thereon said colloidal activating metal species, to delineate an uncoated surface pattern capable of retaining the colloidal activating metal species thereon; and thereafter (b) treating said selectively coated surface with a sol comprising said colloidal activating metal species to deposit said colloidal activating metal species only on said uncoated surface pattern.
Claim 3
Dependent Claim
15 words
The method as defined in claim 1 wherein said monomer is a methyl vinyl ether.
Claim 4
Dependent Claim
17 words
The method as defined in claim 1 wherein said colloidal activating metal species comprises colloidal palladium metal.
Claim 5
Dependent Claim
22 words
The method as defined in claim 1 wherein said sol comprises a colloidal suspension of stannous chloride and a noble metal salt.
Claim 6
Dependent Claim
26 words
The method as defined in claim 1 wherein, immediately following step (b), said treated surface is rinsed with an inert rinsing agent to remove excess sol.
Claim 7
Dependent Claim
28 words
The method as defined in claim 1 which further comprises exposing said colloidal species deposited pattern to an electroless metal deposition solution to electrolessly deposit a metal thereon.
Claim 8
Independent Claim
129 words
A method of selectively depositing a metal on a dielectric surface capable of retaining thereon a colloidal noble metal species, which comprises: (a) selectively coating the dielectric surface by coating a portion thereof with a copolymer coat of maleic anhydride and a vinyl monomer, wherein said coat is selectively incapable of retaining thereon a colloidal noble metal species that is an activator for electroless metal deposition, to delineate an uncoated dielectric surface pattern capable of retaining the colloidal noble metal species; and thereafter (b) treating said selectively coated surface with a sol comprising said colloidal noble metal species to deposit said colloidal noble metal only on said uncoated pattern; and (c) exposing said noble metal deposited patterned surface to an electroless metal deposition solution to deposit a metal thereon.
Claim 9
Independent Claim
129 words
A method of selectively depositing a metal on a dielectric surface capable of retaining thereon a colloidal noble metal species, which comprises: (a) selectively coating the dielectric surface by coating a portion thereof with a copolymer coat of maleic anhydride and a vinyl monomer, wherein said coat is selectively incapable of retaining thereon a colloidal noble metal species that is an activator for electroless metal deposition, to delineate an uncoated dielectric surface pattern capable of retaining the colloidal noble metal species; and thereafter (b) treating said selectively coated surface with a sol comprising said colloidal noble metal species to deposit said colloidal noble metal only on said uncoated pattern; and (c) exposing said noble metal deposited patterned surface to an electroless metal deposition solution to deposit a metal thereon.
Claim 10
Dependent Claim
15 words
The method as defined in claim 7 wherein said monomer is a methyl vinyl ether.
Claim 11
Dependent Claim
26 words
The method as defined in claim 8 wherein, immediately following step (b), said treated surface is rinsed with an inert rinsing agent to remove excess sol.
Claim 12
Dependent Claim
21 words
The method as defined in claim 9 wherein said sol comprises a colloidal suspension of stannous chloride and palladium metal salt.
Claim 13
Dependent Claim
15 words
The method as defined in claim 9 wherein said noble metal species comprises palladium metal.
Claim 14
Independent Claim
110 words
A method of selectively depositing a metal on a coated surface of a substrate, which comprises: (a) coating the substrate surface with a copolymer of maleic anhydride and a vinyl monomer to form a copolymer coat, said coat being selectively incapable of retaining thereon a colloidal noble metal species that is an activator for electroless metal deposition; (b) selectively coating the copolymer-coated surface with a material capable of retaining the colloidal noble metal species thereon, to form a surface pattern of said material; and thereafter (c) treating said patterned surface with a sol comprising a colloidal noble metal species to deposit said colloidal noble metal species only on said pattern.
Claim 15
Independent Claim
110 words
A method of selectively depositing a metal on a coated surface of a substrate, which comprises: (a) coating the substrate surface with a copolymer of maleic anhydride and a vinyl monomer to form a copolymer coat, said coat being selectively incapable of retaining thereon a colloidal noble metal species that is an activator for electroless metal deposition; (b) selectively coating the copolymer-coated surface with a material capable of retaining the colloidal noble metal species thereon, to form a surface pattern of said material; and thereafter (c) treating said patterned surface with a sol comprising a colloidal noble metal species to deposit said colloidal noble metal species only on said pattern.
Claim 16
Dependent Claim
15 words
The method as defined in claim 12 wherein said monomer is a methyl vinyl ether.
Claim 17
Dependent Claim
17 words
The method as defined in claim 12 wherein said colloidal noble metal species comprises colloidal palladium metal.
Claim 18
Dependent Claim
20 words
The method as defined in claim 12 wherein said sol comprises a colloidal suspension of stannous chloride and palladium metal.
Claim 19
Dependent Claim
26 words
The method as defined in claim 12 wherein, immediately following step (c), said treated surface is rinsed with an inert rinsing agent to remove excess sol.
Claim 20
Dependent Claim
27 words
The method as defined in claim 12 which further comprises treating said noble-metal deposited patterned surface with an electroless metal deposition solution to deposit a metal thereon.
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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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |