US4152282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silk-screening dielectric paste for multilayer circuit fabrication comprising aluminum oxide and a borosilicate glass
Assignee: US Philips Corp
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Filing: 1977-12-12
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Granted: 1979-05-01
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Expires: 1997-12-12
Abstract
Abstract A dielectric composition which may be used as an insulating silk-screening paste and is compatible with a copper-containing conductive silk-screened layer, such as used in multilayer circuit boards. The paste includes an organic carrier, a mixture of aluminum oxide, and one or more types of glass of the "short" type, of which at least one glass can be devitrified by dissolution of the aluminum oxide.
Inventors
- 👤 Hugues Baudry
- 👤 Marc A. Monneraye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; C; C03; C03C; C03C14/00; C03C14/004; C03C2214/00; C03C2214/04; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/46; H05K3/4644; H05K3/4664; H05K3/4667
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
A silk-screening paste for multilayer circuit fabrication comprising: a dielectric mixture of borosilicate glass present in a quantity between 40 and 70% by volume and having a composition consisting essentially of the following ranges in mol.%: 10-40 SiO 2 20-40 znO 15-35 b 2 o 3 0-5 al 2 O 3 5-25 caO 0-15 srO; aluminum oxide in a quantity between 30 and 60% by volume; and a coloring oxide in a quantity smaller than 1 mol.%, said coloring oxide including cobalt oxide in a quantity of 0.5 mol.%, dispersed in an organic carrier.
Claim 2
Dependent Claim
94 words
A silk-screening paste for multilayer circuit fabrication comprising: a dielectric mixture of borosilicate glass present in a quantity between 40 and 70% by volume and having a composition consisting essentially of the following ranges in mol.%: 10-40 SiO 2 20-40 znO 15-35 b 2 o 3 0-5 al 2 O 3 5-25 caO 0-15 srO; aluminum oxide in a quantity between 30 and 60% by volume; and a coloring oxide in a quantity smaller than 1 mol.%, said coloring oxide including cobalt oxide in a quantity of 0.5 mol.%, dispersed in an organic carrier.
Claim 3
Dependent Claim
35 words
A silk-screening paste as defined in claim 1 wherein said borosilicate glass consists essentially of in mol.%: 40 SiO 20 znO 15 b 2 o 3 5 al 2 O 3 5 caO 15 srO.
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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |