US4781969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible printed circuit board
Assignee: Junkosha Co Ltd
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Filing: 1987-09-29
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Granted: 1988-11-01
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Expires: 2007-09-29
Abstract
Abstract A printed circuit board is provided wherein a composite metal layer is affixed to at least one surface of a flexible dielectric substrate, the composite metal layer comprising an inner aluminum layer and an outer copper layer. Owing to the relatively high elongation of the aluminum layer, when the printed circuit board is flexed the circuit thereon does not crack.
Inventors
- 👤 Satoru Kobayashi
- 👤 Tetsuya Hirose
- 👤 Masahiro Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/03; H05K1/0313; H05K1/032; H05K1/034; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0338; H05K2201/0355; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/1216; Y10T428/12361; Y10T428/12389; Y10T428/12396; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12736; Y10T428/1275; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
A flexible printed circuit board comprising a composite metal circuit affixed to at least one surface of a flexible dielectric substrate, said composite circuit comprising an inner aluminum layer adjacent said flexible dielectric substrate and an outer copper layer adjacent said aluminum layer.
Claim 2
Dependent Claim
43 words
A flexible printed circuit board comprising a composite metal circuit affixed to at least one surface of a flexible dielectric substrate, said composite circuit comprising an inner aluminum layer adjacent said flexible dielectric substrate and an outer copper layer adjacent said aluminum layer.
Claim 3
Dependent Claim
43 words
The flexible printed circuit board of claim 1 wherein said flexible dielectric substrate comprises a layer of porous, expanded polytetrafluoroethylene, said substrate sandwiched between said metal circuit affixed on either side of said substrate by means of a film of ethylene tetrafluoroethylene adhesive.
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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |