US4103102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced flexible printed wiring board
Assignee: AT&T Inc
•
Filing: 1976-07-01
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Granted: 1978-07-25
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Expires: 1996-07-01
Abstract
Abstract An improved reinforced flexible printed wiring board is disclosed. The reinforcement in this printed wiring board is composed of a fabric woven from a yarn of plied continuous filaments of polyester and glass. The fabric is impregnated with an appropriate resin which is subsequently cured. This printed wiring board is found to have improved mechanical and thermal characteristics with little degradation in electrical properties.
Inventors
- 👤 Theodore Harold Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0145; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/029; H05K2203/00; H05K2203/12; H05K2203/127
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A reinforced flexible printed wiring board comprising a resin impregnated woven fabric upon which a metallic circuit configuration is defined: (a) said woven fabric comprising a yarn of at least one continuous glass fiber twisted relatively about at least one continuous polyester fiber with a periodicity between 0.1 and 10 twists per inch, said glass fiber coated with a lubricant; (b) said resin being a flexible resin which is at least partially cured, said resin impregnated fabric having insulation resistance greater than 1 × 10 9 ohms, propagation tear strength greater than 0.5 pounds, and dimensional stability greater than 2 mils per inch; and (c) said metallic circuit configuration having a peel strength greater than three pounds per inch of conductor width.
Claim 2
Dependent Claim
122 words
A reinforced flexible printed wiring board comprising a resin impregnated woven fabric upon which a metallic circuit configuration is defined: (a) said woven fabric comprising a yarn of at least one continuous glass fiber twisted relatively about at least one continuous polyester fiber with a periodicity between 0.1 and 10 twists per inch, said glass fiber coated with a lubricant; (b) said resin being a flexible resin which is at least partially cured, said resin impregnated fabric having insulation resistance greater than 1 × 10 9 ohms, propagation tear strength greater than 0.5 pounds, and dimensional stability greater than 2 mils per inch; and (c) said metallic circuit configuration having a peel strength greater than three pounds per inch of conductor width.
Claim 3
Dependent Claim
16 words
The product of claim 1 wherein the ratio of polyester-to-glass surface area is greater than 1/10.
Claim 4
Dependent Claim
43 words
The product of claim 1 wherein the resin composition is given by the following values: ______________________________________
Epoxy Resin 100.0
Antimony Oxide 0-80
Chlorinated Hydrocarbon
Flame Retardant 0-160
Maleic Anhydride Adduct
of Methylcyclopentadiene
68-95
Carboxy Terminated
Butadiene-Acrylonitrile 69-107
2,4,6-Tri(dimethylaminomethyl)
Phenol 0.5-3.0
Antioxidant 0.1-6.0.
______________________________________
Claim 5
Dependent Claim
53 words
The product of claim 1 wherein the resin composition is given by the following values: ______________________________________
Epoxy Resin 100.0
Antimony Oxide 55.4±6.0
Chlorinated Hydrocarbon
Flame Retardant 110.9 ± 11.0
Maleic Anhydride Adduct
of Methylcyclopentadiene
86.7 ± 5.0
Carboxy Terminated
Butadiene-Acrylonitrile 90.4 ± 3.0
2,4,6-Tri(dimethylaminomethyl)
Phenol 1.5 ± 0.5
Antioxidant 0.5 ± 3.0
______________________________________
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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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |