US4536329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borosilicate glass compositions
Assignee: EIDP Inc
•
Filing: 1983-12-19
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Granted: 1985-08-20
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Expires: 2003-12-19
Abstract
Abstract The invention is directed to a barium borosilicate glass which is free of Bi, Cd and Pb. The glass, which also contains small amounts of CoO, is especially useful as a binder for thick film resistor compositions to be used for making high-end resistors.
Inventors
- 👤 Jacob Hormadaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:20
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/04; C03C3/062; C03C3/064; H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/0658
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A glass which is suitable for use as a binder in high end resistors, which is substantially free of Bi, Cd and Pb and on a molar basis consists essentially of: A. 50-85% of glass forming materials consisting of 25-55% B 2 O 3 , 15-40% SiO 2 ; 0-10% ZrO 2 and 0-5% SnO 2 , and B. 50-15% of glass modifying materials consisting of 10-30% BaO, 1-10% CoO and 0-12% oxides of alkaline earth metals having atomic numbers 12-38, providing that (1) the mole ratio B 2 O 3 /SiO 2 =≧0.8; and (2) Σ (B 2 O 3 +SiO 2 )≧50.
Claim 2
Dependent Claim
104 words
A glass which is suitable for use as a binder in high end resistors, which is substantially free of Bi, Cd and Pb and on a molar basis consists essentially of: A. 50-85% of glass forming materials consisting of 25-55% B 2 O 3 , 15-40% SiO 2 ; 0-10% ZrO 2 and 0-5% SnO 2 , and B. 50-15% of glass modifying materials consisting of 10-30% BaO, 1-10% CoO and 0-12% oxides of alkaline earth metals having atomic numbers 12-38, providing that (1) the mole ratio B 2 O 3 /SiO 2 =≧0.8; and (2) Σ (B 2 O 3 +SiO 2 )≧50.
Claim 3
Dependent Claim
20 words
The glass of claim 1 in which the Group A materials constitute 65-75% and the Group B materials constitute 35-25%.
Claim 4
Dependent Claim
48 words
A composition which is comprised of 95-99.9% wt. of the glass of claim 1 and 5-0.1% wt. of a metal fluoride selected from the group consisting of CaF 2 , BaF 2 , MgF 2 , SrF 2 , NaF, LiF, KF and NiF 2 and mixtures thereof.
Claim 5
Dependent Claim
44 words
A printable thick film resistor composition comprising a dispersion in organic medium of an admixture of finely divided particles of (a) 95-55% wt. tin oxide pyrochlore-based conductive phase and (b) 5-45% wt. of the glass of claim 1 or the composition of claim 3.
Claim 6
Dependent Claim
36 words
A resistor comprising a patterned thin layer of the composition of claim 3 which has been fired in a nonoxidizing atmosphere to effect volatilization of the organic medium and sintering of the glass and conductive phase.
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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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |