Patent US3940534A successfully refreshed from Google Patents.
US3940534A
Expired / Lapsed
US
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Electrical laminate
Assignee: GT Schjeldahl Co
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Filing: 1974-08-05
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Granted: 1976-02-24
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Expires: 1994-08-05
Abstract
Abstract A mechanically sound electrically stable substrate for use in an electrical laminate wherein the substrate supports at least one electrically conductive metallic layer. The substrate portion comprises a woven glass cloth base pad which is interposed between a pair of outer substrate layers of a polyester mat. The polyester mat comprises a mat of spunbonded continuous filament polyester fibers, preferably polyethylene terephthalate fibers, calendered, with the fibers including a mixture of bulk fibers of relatively high melting point retained in place or bonded by a binder fiber of essentially the same polyester material but with a relatively lower melting point. In fabrication, the mat, along with the glass cloth, is saturated with a curable resin, for example a heat curable resin, preferably polybutadiene, which is cured in-situ.
Inventors
- 👤 Herbert J. Fick
- 👤 Edward J. Mahagnoul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:19
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; B; B32; B32B; B32B15/00; B32B15/14; B32B5/00; B32B5/22; B32B5/24; B32B5/26; H05K1/0366; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2262/0284; B32B2262/10; B32B2262/101; B32B2262/14; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/20; B32B2307/206; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0133; H05K2201/0137; H05K2201/0145; H05K2201/0158; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0239; H05K2201/0275; H05K2201/0278; H05K2201/029; H05K2201/0293; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31678; Y10T428/31681; Y10T442/00; Y10T442/30; Y10T442/3707; Y10T442/378; Y10T442/3813
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
In laminate means for electrically isolating and supporting an electrically conductive metallic layer; the laminate consisting of at least one electrically conductive layer disposed upon a substrate surface, the substrate portion comprising, in combination: a. woven glass cloth base pad means interposed between a pair of outer substrate layers of polyester mat, said woven glsss cloth consisting essentially of glass filamentary fibers with a thickness of between about 1 and 5 mils, and woven together to form a fabric; b. said polyester mat comprising a mat of spunbonded continuous filamentary polyester fibers with the fibers having a bulk fiber content of between about 85% to 92% of first polyester fibers consisting essentially of oriented polyethylene terephthalate with a certain first melting point, balance of a second thermoplastic polyester fibers consisting essentially of non-oriented polyethylene terephthalate and having a significantly lower melting point than said first polyester fibers, and with said polyester mat having a weight of between about 20 and 30 grams per square yard.
Claim 2
Dependent Claim
165 words
In laminate means for electrically isolating and supporting an electrically conductive metallic layer; the laminate consisting of at least one electrically conductive layer disposed upon a substrate surface, the substrate portion comprising, in combination: a. woven glass cloth base pad means interposed between a pair of outer substrate layers of polyester mat, said woven glsss cloth consisting essentially of glass filamentary fibers with a thickness of between about 1 and 5 mils, and woven together to form a fabric; b. said polyester mat comprising a mat of spunbonded continuous filamentary polyester fibers with the fibers having a bulk fiber content of between about 85% to 92% of first polyester fibers consisting essentially of oriented polyethylene terephthalate with a certain first melting point, balance of a second thermoplastic polyester fibers consisting essentially of non-oriented polyethylene terephthalate and having a significantly lower melting point than said first polyester fibers, and with said polyester mat having a weight of between about 20 and 30 grams per square yard.
Claim 3
Dependent Claim
39 words
The laminate means as defined in claim 1 being particularly characterized in that said electrically conductive layers are bonded to said substrate by a synthetic resin consisting essentially of a mixture of 1,2-polybutadiene and 1,4-polybutadiene in the polymer chain.
Claim 4
Dependent Claim
41 words
The laminate means as defined in claim 1 being particularly characterized in that the filamentary fibers comprising said woven glass cloth are coated with a film of a silane selected from the group consisting of vinyl triacetoxysilane and vinyl-tris (betaethoxymethoxy) silane.
Claim 5
Dependent Claim
40 words
The laminate means as defined in claim 2 being particularly characterized in that the filamentary fibers comprising said woven glass cloth are coated with a film of silane selected from the group consisting of vinyl triacetoxysilane and vinyl-tris (betaethoxymethoxy) silane.
Claim 6
Dependent Claim
38 words
The laminate means as defined in claim 1 being particularly characterized in that said laminate is secured together by a resin curable under heat and pressure and selected from the group consisting of polybutadiene, epoxy, polyester, and melamine.
Claim 7
Dependent Claim
55 words
The laminate means as defined in claim 1 being particularly characterized in that said polyester mat consists of a mixture of at least two polyester fibers having distinctly different melting points, wherein the lower melting polyester fiber is a binder and contained in said mat in a quantity ranging from between about 5 and 15%.
Claim 8
Dependent Claim
57 words
The laminate means as defined in claim 1 being particularly characterized in that said substrate layers and said electrically conductive layers are bonded together by a synthetic resin consisting essentially of polybutadiene, said polybutadiene containing between about 45% and 90% 1,2-polybutadiene, balance 1,4-polybutadiene, said synthetic resin having an average molecular weight of between about 2,000 and 20,000.
Claim 9
Dependent Claim
180 words
In laminate means for electrically isolating and supporting an electrically conductive metallic layer; the laminate consisting of at least one electrically conductive layer disposed upon a substrate surface, the substrate portion comprising, in combination: a. a woven glass cloth base pad having a high modulus of elasticity in the range of approximately 10 × 10 6 and a tensile strength ranging from between about 200,000 psi to 400,000 psi, and being interposed between a pair of outer substrate layers of polyester mat, said woven fiber being bonded directly to said polyester mat; b. said polyester mat comprising a mat of spunbonded continuous filamentary polyester fibers with the fibers having a bulk fiber content of between about 84% to 92% of first polyester fibers consisting essentially of oriented polyethylene terephthalate and having a certain first melting point, the balance being binder polyester fibers consisting essentially of non-oriented polyethylene terephthalate and with a certain second and significantly lower melting point than said first polyester fibers, and with said mat having a weight of between about 20 and 30 grams per square yard.
Claim 10
Dependent Claim
180 words
In laminate means for electrically isolating and supporting an electrically conductive metallic layer; the laminate consisting of at least one electrically conductive layer disposed upon a substrate surface, the substrate portion comprising, in combination: a. a woven glass cloth base pad having a high modulus of elasticity in the range of approximately 10 × 10 6 and a tensile strength ranging from between about 200,000 psi to 400,000 psi, and being interposed between a pair of outer substrate layers of polyester mat, said woven fiber being bonded directly to said polyester mat; b. said polyester mat comprising a mat of spunbonded continuous filamentary polyester fibers with the fibers having a bulk fiber content of between about 84% to 92% of first polyester fibers consisting essentially of oriented polyethylene terephthalate and having a certain first melting point, the balance being binder polyester fibers consisting essentially of non-oriented polyethylene terephthalate and with a certain second and significantly lower melting point than said first polyester fibers, and with said mat having a weight of between about 20 and 30 grams per square yard.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |