US3848079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pointed circuits with crystallized glass low k crossover dielectrics
Assignee: EIDP Inc
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Filing: 1973-07-19
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Granted: 1974-11-12
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Expires: 1993-07-19
Abstract
Abstract Partially crystallizable glasses which upon firing form crossover dielectrics for use in printed circuits. The glasses are in finely divided form and are optionally dispersed in an inert liquid vehicle. The resultant partially crystallized crossover dielectrics consist essentially of 20-48 percent by weight crystals dispersed in a glassy matrix and exhibit reduced dielectric constant (K).
Inventors
- 👤 R Amin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4685; C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C10/0054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A DENSE, LEAD-FREE CROSSOVER DIELECTRIC INTERPOSED BETWEEN TWO CONDUCTOR PATTERNS ON A DIELECTRIC SUBSTRATE, SAID CORSSOVER DIELECTRIC CONSISTING ESSENTIALLY OF 20-48 PERCENT BY WEIGHT CRYSTALS IN A GLASSY MIXTURE, SAID CRYSTALS CONSISTING ESSENTIALLY OF CELSIAN AND THE MAJOR PHASE IN ADDITION TO LESSER AMOUNTS OF SPHENE AND ZINC ORTHOSILICATE; SAID CROSSOVER DIELECTRIC BEING THE FIRED PRODUCT OF A LEAD-FREE CRYSTALLIZABLE GLASS COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, APPROXIMATELY 25-40% SIO2 5-15% TIO2 7-12% AL2O3 10-30% BAO 10-26% ZNO 2-10% CAO 2-8% B2O3 0-2% MGO 0-4% BI2O3 THE TOTAL OF BAO AND ZNO BEING 30-40 PERCENT OF THE GLASS COMPOSITION.
Claim 2
Dependent Claim
99 words
A DENSE, LEAD-FREE CROSSOVER DIELECTRIC INTERPOSED BETWEEN TWO CONDUCTOR PATTERNS ON A DIELECTRIC SUBSTRATE, SAID CORSSOVER DIELECTRIC CONSISTING ESSENTIALLY OF 20-48 PERCENT BY WEIGHT CRYSTALS IN A GLASSY MIXTURE, SAID CRYSTALS CONSISTING ESSENTIALLY OF CELSIAN AND THE MAJOR PHASE IN ADDITION TO LESSER AMOUNTS OF SPHENE AND ZINC ORTHOSILICATE; SAID CROSSOVER DIELECTRIC BEING THE FIRED PRODUCT OF A LEAD-FREE CRYSTALLIZABLE GLASS COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, APPROXIMATELY 25-40% SIO2 5-15% TIO2 7-12% AL2O3 10-30% BAO 10-26% ZNO 2-10% CAO 2-8% B2O3 0-2% MGO 0-4% BI2O3 THE TOTAL OF BAO AND ZNO BEING 30-40 PERCENT OF THE GLASS COMPOSITION.
Claim 3
Dependent Claim
24 words
A crossover dielectric according to claim 1 which is the fired product of a lead-free crystallizable glass composition consisting essentially of, by weight, approximately,
Claim 4
Dependent Claim
24 words
A crossover dielectric according to claim 1, which is the fired product of a lead-free crystallizable glass composition consisting essentially of, by weight, approximately,
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |