Patent US4174531A successfully refreshed from Google Patents.
US4174531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board with increased arc track resistance
Assignee: RCA Corp
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Filing: 1977-11-14
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Granted: 1979-11-13
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Expires: 1997-11-14
Abstract
Abstract This invention pertains to increasing the arc track resistance of printed circuit boards by applying an acrylic resin to the printed circuit board wherein the acrylic resin is a polymer having the recurring unit: ##STR1## wherein x of each unit is independently selected from integers of 0 to 15 and each R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of H, --CH 3 and --C 2 H 5 .
Inventors
- 👤 Donald C. McCarthy
- 👤 Martin Rayl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:32
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; H01; H01B; H01B5/00; H01B5/14; H05K2201/00; H05K2201/10; H05K2201/10613; H05K2201/10954; H05K2201/10977; H05K2203/00; H05K2203/13; H05K2203/1305; H05K2203/1322; H05K3/30; H05K3/32; H05K3/34; H05K3/3447; H05K3/3452
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
159 words
A printed circuit board consisting essentially of: (a) an electrically insulative substrate; (b) a conductive network layer bonded to the substrate; (c) a solder resist material adhered to selected areas of the network layer and the substrate; (d) solder bonded to selected areas of the network layer; (e) components affixed by means of electrical leads to the conductive layers by the solder; and (f) an acrylic resin coated over the substrate, network layer, solder and solder resist material wherein the acrylic resin is a polymer having the recurring unit of the formula: ##STR4## wherein x of each unit is independently selected from integers of 0 to 15 and each R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of H, --CH 3 and --C 2 H 5 and whereby the acrylic resin coating increases the arc track resistance of an electrical potential applied to the circuit board.
Claim 2
Dependent Claim
159 words
A printed circuit board consisting essentially of: (a) an electrically insulative substrate; (b) a conductive network layer bonded to the substrate; (c) a solder resist material adhered to selected areas of the network layer and the substrate; (d) solder bonded to selected areas of the network layer; (e) components affixed by means of electrical leads to the conductive layers by the solder; and (f) an acrylic resin coated over the substrate, network layer, solder and solder resist material wherein the acrylic resin is a polymer having the recurring unit of the formula: ##STR4## wherein x of each unit is independently selected from integers of 0 to 15 and each R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of H, --CH 3 and --C 2 H 5 and whereby the acrylic resin coating increases the arc track resistance of an electrical potential applied to the circuit board.
Claim 3
Dependent Claim
18 words
A printed circuit board according to claim 1 wherein the electrically insulative substrate is a phenolic paper board.
Claim 4
Dependent Claim
17 words
A printed circuit board according to claim 1 wherein the conductive network layer is a copper layer.
Claim 5
Dependent Claim
18 words
A printed circuit board according to claim 1 wherein the solder resist material is an epoxy polyester amide.
Claim 6
Dependent Claim
20 words
A printed circuit board according to claim 1 wherein the acrylic resin is a copolymer of methyl methacrylate butyl methacrylate.
Claim 7
Dependent Claim
19 words
A printed circuit board according to claim 4 wherein the copolymer has a molecular weight greater than about 1,000,000.
Claim 8
Dependent Claim
25 words
A printed circuit board according to claim 1 wherein the acrylic resin has a glass transition temperature of about 30° C. to about 80° C.
Claim 9
Dependent Claim
25 words
A printed circuit board according to claim 1 wherein the acrylic resin has a glass transition temperature of about 35° C. to about 50° C.
Claim 10
Independent Claim
97 words
A method of increasing the arc track resistance of a printed circuit board having an electrically insulative substrate and a conductive network bonded to said substrate which comprises coating the conductive network and the substrate with an acrylic resin which is a polymer having recurring units of the formula: ##STR5## wherein x of each unit is independently selected from integers of 0 to 15 and each R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of H, --CH 3 and --C 2 H 5 .
Claim 11
Independent Claim
97 words
A method of increasing the arc track resistance of a printed circuit board having an electrically insulative substrate and a conductive network bonded to said substrate which comprises coating the conductive network and the substrate with an acrylic resin which is a polymer having recurring units of the formula: ##STR5## wherein x of each unit is independently selected from integers of 0 to 15 and each R 1 , R 2 , R 3 , R 4 and R 5 is independently selected from the group consisting of H, --CH 3 and --C 2 H 5 .
Claim 12
Dependent Claim
52 words
A method according to claim 9 which further comprises forming holes in the substrate inserting electrical leads from components into the holes, applying solder resist material to the conductive network and substrate, and soldering the electrical leads to the conductive network wherein the acyrlic resin coats the solder resist material and solder.
Claim 13
Dependent Claim
19 words
A method according to claim 9 wherein the acrylic resin is a copolymer of methyl methacrylate and butyl methacrylate.
References Cited (Backward Citations)
US3628999A
Cited
US4051550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |