US3881904A
Expired / Lapsed
US
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Method of joining a pair of silicon nitride parts
Assignee: ZF International UK Ltd
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Filing: 1974-02-13
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Granted: 1975-05-06
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Expires: 1994-02-13
Abstract
Abstract To join a pair of silicon nitride parts, a powdered glass consisting of silica, alumina and an alkaline earth metal oxide is provided on at least one of the parts to be joined. The powdered glass is then heated so as to produce molten glass between the parts whereby, on cooling, the glass provides a joint between the parts.
Inventors
- 👤 Roger Francis Stokes
- 👤 Brian John Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C03; C03C; C03C8/00; C03C8/24; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/368
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A METHOD OF JOINING A PAIR OF SILICON NITRIDE PARTS COMPRISING THE STEPS OF: A. PROVIDING ON AT LEAST OF THE PARTS TO BE JOINED A POWDERED GLASS CONSISTING OF BETWEEN 50 AND 80 WEIGHT SILICA, BETWEEN 10 AND 40 PERCENT BY WEIGHT ALUMINA, AND BETWEEN 10 AND 25 PERCENT BY WEIGHT MAGNESIUM OXIDE, AND B. HEATING THE POWDERED GLASS SO AS TO PRODUCE MOLTEN GLASS BETWEEN THE PARTS WHEREBY; ON COOLING, THE GLASS PROVIDES A JOINT BETWEEN THE PARTS.
Claim 2
Independent Claim
80 words
A METHOD OF JOINING A PAIR OF SILICON NITRIDE PARTS COMPRISING THE STEPS OF: A. PROVIDING ON AT LEAST OF THE PARTS TO BE JOINED A POWDERED GLASS CONSISTING OF BETWEEN 50 AND 80 WEIGHT SILICA, BETWEEN 10 AND 40 PERCENT BY WEIGHT ALUMINA, AND BETWEEN 10 AND 25 PERCENT BY WEIGHT MAGNESIUM OXIDE, AND B. HEATING THE POWDERED GLASS SO AS TO PRODUCE MOLTEN GLASS BETWEEN THE PARTS WHEREBY; ON COOLING, THE GLASS PROVIDES A JOINT BETWEEN THE PARTS.
Claim 3
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 15 and 63 percent by weight silica, between 11 and 53 percent by weight alumina, and between 11 and 50 percent by weight calcium oxide, and b. heating the powdered glass so as to produce molten glass between the parts whereby, on cooling, the glass provides a joint between the parts.
Claim 4
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 15 and 63 percent by weight silica, between 11 and 53 percent by weight alumina, and between 11 and 50 percent by weight calcium oxide, and b. heating the powdered glass so as to produce molten glass between the parts whereby, on cooling, the glass provides a joint between the parts.
Claim 5
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 27 and 50 percent by weight silica, between 5 and 38 percent by weight alumina, and between 25 and 70 percent by weight strontium oxide, and b. heating the powdered glass so as to produce molten glass betweeN the parts whereby, on cooling the glass provides a joint between the parts.
Claim 6
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 27 and 50 percent by weight silica, between 5 and 38 percent by weight alumina, and between 25 and 70 percent by weight strontium oxide, and b. heating the powdered glass so as to produce molten glass betweeN the parts whereby, on cooling the glass provides a joint between the parts.
Claim 7
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 18 and 50 percent by weight silica, between 10 and 37 percent by weight alumina, and between 30 and 65 percent by weight barium oxide, and b. heating the powdered glass so as to produce molten glass between the parts whereby, on cooling the glass provides a joint between the parts.
Claim 8
Independent Claim
83 words
A method of joining a pair of silicon nitride parts comprising the steps of: a. providing on at least one of the parts to be joined a powdered glass consisting of between 18 and 50 percent by weight silica, between 10 and 37 percent by weight alumina, and between 30 and 65 percent by weight barium oxide, and b. heating the powdered glass so as to produce molten glass between the parts whereby, on cooling the glass provides a joint between the parts.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |