US4191577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing slurry
Assignee: GTE Sylvania Inc
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Filing: 1978-10-26
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Granted: 1980-03-04
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Expires: 1998-10-26
Abstract
Abstract A composition for a brazing slurry which will form solid connections below 1600° C. The composition comprises, by weight, about 21% to 22% fine particle tungsten; about 7% to 8% calcium oxide; about 5% to 6% silicon dioxide; about 5% to 6% titanium dioxide; about 3% to 4% aluminum oxide; and about 55.5 % to 57.5 % of an organic binder. The composition is well suited to attaching leads to metallized patterns formed on ceramic substrate and can also be employed as the pattern forming material.
Inventors
- 👤 William E. Buescher
- 👤 Frederick J. Roberto
- 👤 Isabelle M. Sobierajski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:50
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; C; C23; C23C; C23C24/00; C23C24/08; C23C24/10; C23C24/103; H; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H10W70/666
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A brazing composition comprising, by weight, a substantially homogeneous suspension of about 21-22% fine particle metallic tungsten; about 7-8% calcium oxide; about 5-6% silicon dioxide; about 5-6% titanium dioxide; about 3-4% aluminum oxide; and about 55.5-57.5% of an organic binder.
Claim 2
Dependent Claim
40 words
A brazing composition comprising, by weight, a substantially homogeneous suspension of about 21-22% fine particle metallic tungsten; about 7-8% calcium oxide; about 5-6% silicon dioxide; about 5-6% titanium dioxide; about 3-4% aluminum oxide; and about 55.5-57.5% of an organic binder.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein said organic binder comprises, by weight of said composition, about 43-44% ethylene carbonate and about 12.5-13.5% ethyl cellulose.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein said binder has a viscosity of about 312 centipoises.
Claim 5
Dependent Claim
47 words
The composition of claim 3 comprising 50 grams of said tungsten; 16.5 grams of said calcium oxide; 13.7 grams of said silicon dioxide; 13.1 grams of said titanium dioxide; 6.7 grams of said aluminum oxide; 100 grams of said ethylene carbonate; 30 grams of said ethyl cellulose.
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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |