US3568000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer printed circuit
Assignee: Alcatel Lucent SAS
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Filing: 1968-11-21
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Granted: 1971-03-02
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Expires: 1988-11-21
Abstract
Abstract Multilayer printed circuit for signals whose rise time is less than one nanosecond. The conductive layers are stacked in the following order starting at any of the outer faces: connecting layer, ground layer, supply layer, ground layer. Thus, connections may be made by means of fixed-impedance microstrip lines and supply by means of very low impedance strip lines (less than a fraction of 1 ohm).
Inventors
- 👤 Francois Regis D Aboville
- 👤 Jean-Francois Martre
- 👤 Claude Cherdo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:53
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/088; H05; H05K; H05K1/00; H05K1/02; H05K1/0213; H05K1/0237; H05K1/024; H05K3/00; H05K3/46; H05K3/4611; H05K3/4641; H05K2201/00; H05K2201/01; H05K2201/0183; H05K2201/0191; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2201/09; H05K2201/09209; H05K2201/0929; H05K2201/09309; H05K3/40; H05K3/42; H05K3/429
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
204 words
A multilayer printed circuit for briefly varying signals, comprising: a stack of at least partially conductive layers and alternate insulating plates, at least one of said layers consisting of separate conductors which establish the connections between electronic elements supported by the printed circuit, at least one other of said layers connecting a unidirectional voltage source to these elements, at least one other of said layers connected to an electric ground, means including conductive walls extending through holes in said stack to electrically connect the layers, said layers being stacked in the following order starting from either of the two outer connecting layers; ground layer, supply layer, ground layer, and ending with the other Of the two outer connecting layers, wherein said connecting layers consist of several metallic strips which transmit electric impulses and a metallic film, said metallic strips and said metallic film being separated by an insulating plate much thicker than said metallic film to insure good mechanical strength, and said supply layer consists of a metallic strip separated from a metallic film by insulating plates of a thickness on the order of said metallic film so that the characteristic impedance of the strip-line supply layer thus formed is less than 1 ohm.
Claim 2
Dependent Claim
204 words
A multilayer printed circuit for briefly varying signals, comprising: a stack of at least partially conductive layers and alternate insulating plates, at least one of said layers consisting of separate conductors which establish the connections between electronic elements supported by the printed circuit, at least one other of said layers connecting a unidirectional voltage source to these elements, at least one other of said layers connected to an electric ground, means including conductive walls extending through holes in said stack to electrically connect the layers, said layers being stacked in the following order starting from either of the two outer connecting layers; ground layer, supply layer, ground layer, and ending with the other Of the two outer connecting layers, wherein said connecting layers consist of several metallic strips which transmit electric impulses and a metallic film, said metallic strips and said metallic film being separated by an insulating plate much thicker than said metallic film to insure good mechanical strength, and said supply layer consists of a metallic strip separated from a metallic film by insulating plates of a thickness on the order of said metallic film so that the characteristic impedance of the strip-line supply layer thus formed is less than 1 ohm.
Claim 3
Dependent Claim
70 words
A multilayer printed circuit according to claim 1, wherein at least one of the two outermost insulating plates is formed with an aperture which is closed by a plate having the same dielectrical characteristics and the same thickness as said insulating plate, the closure plate having metallization in continuation with the microstrip lines on said outer conductive layer, having the same characteristic impedance as these lines, and being connected thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |