US3998993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device having a metal surface bearing a corrosion inhibitor
Assignee: AT&T Inc
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Filing: 1975-06-09
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Granted: 1976-12-21
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Expires: 1995-06-09
Abstract
Abstract Electrical device having a metal surface to at least a portion of which electrical connections are to be made by soldering, and having a coating on said portion which protects it against surface alteration which would tend to render such soldering more difficult but through which coating soldering can be effected, said coating comprising a polymer of at least one methacrylate of the general formula ##STR1## wherein R is selected from the group comprising alkyl radicals having from 1-6 carbon atoms and a glycidyl radical.
Inventors
- 👤 Edwin Arthur Chandross
- 👤 Coralie Anne Pryde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B23; B23K; B23K35/00; B23K35/22; B23K35/226; C; C23; C23C; C23C22/00; C23C22/05; C23C22/68; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
Electrical device having a metal surface selected from the group consisting of copper and its alloys to at least a portion of which electrical connections are to be made by soldering, and having a coating on said portion which protects it against surface deterioration which would tend to render such soldering more difficult but through which coating soldering can be effected, said coating comprising successively a surface film of a benzotriazole-copper complex and a layer of a polymer selected from the group consisting of a. homopolymers formed by polymerization of a methacrylate monomer of the general formula ##STR4## wherein R is selected from the group consisting of alkyl radicals of the general formula C n H 2n +1 wherein n is an integer from 1-6, and b. copolymers formed by copolymerization of at least one methacrylate monomer of said general formula wherein R is selected from the group consisting of alkyl radicals of the general formula C n H 2n +1 wherein n is an integer from 1-6, and a glycidyl radical, the said glycidyl monomer being present in said copolymer in an amount ranging up to 10 percent, by weight.
Claim 2
Dependent Claim
191 words
Electrical device having a metal surface selected from the group consisting of copper and its alloys to at least a portion of which electrical connections are to be made by soldering, and having a coating on said portion which protects it against surface deterioration which would tend to render such soldering more difficult but through which coating soldering can be effected, said coating comprising successively a surface film of a benzotriazole-copper complex and a layer of a polymer selected from the group consisting of a. homopolymers formed by polymerization of a methacrylate monomer of the general formula ##STR4## wherein R is selected from the group consisting of alkyl radicals of the general formula C n H 2n +1 wherein n is an integer from 1-6, and b. copolymers formed by copolymerization of at least one methacrylate monomer of said general formula wherein R is selected from the group consisting of alkyl radicals of the general formula C n H 2n +1 wherein n is an integer from 1-6, and a glycidyl radical, the said glycidyl monomer being present in said copolymer in an amount ranging up to 10 percent, by weight.
Claim 3
Dependent Claim
18 words
Device in accordance with claim 1 wherein said layer comprises a copolymer of methyl methacrylate and butyl methacrylate.
Claim 4
Dependent Claim
19 words
Device in accordance with claim 2 wherein said layer further comprises up to 10 percent, by weight, glycidyl methacrylate.
References Cited (Backward Citations)
US3578589A
Cited
US3716421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |