US4774188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of circuit board quality
Assignee: Nokia Bell Labs
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Filing: 1988-01-15
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Granted: 1988-09-27
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Expires: 2008-01-15
Abstract
Abstract Circuit boards with advantageous properties are produced through the addition of a fluorescent dye. The presence of the dye allows an expeditious inspection of the metallic pattern on the circuit board by induced fluorescence.
Inventors
- 👤 Edwin A. Chandross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:53
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0266; H05K1/0269; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; H05K2203/00; H05K2203/16; H05K2203/161; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A patterned substrate comprising a metal pattern overlying a substrate wherein said substrate comprises a cured epoxy and includes a dye capable of fluorescing, wherein said dye is distributed in regions of said substrate underlying said metal pattern and wherein said dye has a chemical structure represented by a member chosen from the group consisting of (1) ##STR3## and (2) ##STR4## where Y is SO 3 G, (G is an alkali metal cation), or H, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Br - , I - , NO 3 - or p-toluenesulfonate.
Claim 2
Dependent Claim
115 words
A patterned substrate comprising a metal pattern overlying a substrate wherein said substrate comprises a cured epoxy and includes a dye capable of fluorescing, wherein said dye is distributed in regions of said substrate underlying said metal pattern and wherein said dye has a chemical structure represented by a member chosen from the group consisting of (1) ##STR3## and (2) ##STR4## where Y is SO 3 G, (G is an alkali metal cation), or H, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Br - , I - , NO 3 - or p-toluenesulfonate.
Claim 3
Dependent Claim
15 words
The patterned substrate of claim 1 wherein said dye is chemically bonded to said substrate.
Claim 4
Dependent Claim
14 words
The patterned substrate of claim 1 wherein said substrate is an electronic circuit board.
Claim 5
Dependent Claim
16 words
The patterned substrate of claim 1 wherein said dye is distributed essentially homogeneously in said substrate.
Claim 6
Dependent Claim
14 words
The patterned substrate of claim 1 wherein said pattern comprises a patterned copper layer.
Claim 7
Dependent Claim
16 words
The patterned substrate of claim 1 wherein said dye is distributed essentially homogeneously in said substrate.
Claim 8
Dependent Claim
14 words
The patterned substrate of claim 6 wherein said pattern comprises a patterned copper plating.
Claim 9
Dependent Claim
146 words
A process for detecting flaws in a metal pattern which is formed on a substrate comprising the step of illuminating said substrate with a source of electromagnetic radiation and detecting the resulting fluorescence from said substrate Characterized in that said substrate comprises a cured epoxy and includes a dye capable of fluorescing, wherein, said dye is distributed in regions of said substrate underlying said metal pattern and wherein said dye comprises a material having a chemical structure represented by a member chosen from the group consisting of (1) ##STR5## and (2) ##STR6## where Y is SO 3 G (G is an alkali metal cation) or hydrogen, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen and Z - is Cl - , Cr - , I - , NO 3 - or P-toluenesulfonate.
Claim 10
Dependent Claim
146 words
A process for detecting flaws in a metal pattern which is formed on a substrate comprising the step of illuminating said substrate with a source of electromagnetic radiation and detecting the resulting fluorescence from said substrate Characterized in that said substrate comprises a cured epoxy and includes a dye capable of fluorescing, wherein, said dye is distributed in regions of said substrate underlying said metal pattern and wherein said dye comprises a material having a chemical structure represented by a member chosen from the group consisting of (1) ##STR5## and (2) ##STR6## where Y is SO 3 G (G is an alkali metal cation) or hydrogen, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen and Z - is Cl - , Cr - , I - , NO 3 - or P-toluenesulfonate.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein said dye is chemically bonded to said substrate.
Claim 12
Dependent Claim
13 words
The process of claim 8 wherein said substrate is an electronic circuit board.
Claim 13
Dependent Claim
29 words
The process of claim 8 wherein said dye has been modified with a functional group that makes said dye more soluble in the material employed to form said substrate.
Claim 14
Dependent Claim
20 words
The process of claim 11 wherein said dye comprises ##STR7## that has been modified to contain an epoxy functional group.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |