US4705585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of glass or glass-ceramic to metal seals with the application of pressure
Assignee: ENERGY United States, Department of
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Filing: 1985-01-04
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Granted: 1987-11-10
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Expires: 2005-01-04
Abstract
Abstract In a process for preparing a glass or glass-ceramic to metal seal comprising contacting the glass with the metal and heat-treating the glass and metal under conditions whereby the glass to metal seal is effected and, optionally, the glass is converted to a glass-ceramic, an improvement comprises carrying out the heat-treating step using hot isostatic pressing.
Inventors
- 👤 Michael D. Kelly
- 👤 Daniel P. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:19
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
In a process for preparing a glass or glass-ceramic to metal seal comprising contacting the glass with the metal and heat-treating the glass and metal under conditions whereby the glass to metal seal is effected and, optionally, the glass is converted to a glass-ceramic, the improvement comprising carrying out the heat-treating step under hot isostatic pressing and using molten glass.
Claim 2
Dependent Claim
60 words
In a process for preparing a glass or glass-ceramic to metal seal comprising contacting the glass with the metal and heat-treating the glass and metal under conditions whereby the glass to metal seal is effected and, optionally, the glass is converted to a glass-ceramic, the improvement comprising carrying out the heat-treating step under hot isostatic pressing and using molten glass.
Claim 3
Dependent Claim
19 words
A process of claim 1 wherein the hot isostatic pressing is carried out at a pressure of 15,000-30,000 psi.
Claim 4
Dependent Claim
19 words
A process of claim 1 wherein the hot isostatic pressing is carried out at a pressure of 10,000-60,000 psi.
Claim 5
Dependent Claim
38 words
A process of claim 3 comprising heating the glass and metal to a temperature at which the glass melts and for a period of time under which the seal is effected, and wherein the glass is not ceramized.
Claim 6
Dependent Claim
97 words
A process of claim 3 wherein the glass is one which forms a glass-ceramic under effective temperature conditions, and comprising heating the glass at a temperature under which the glass melts for a time sufficient for the glass to flow onto the metal and form a bond therewith, heating the glass-metal combination at a temperature and for a period of time effective to create crystallization nuclei in the glass, and then heating the glass at a temperature and for a period of time effective to cause growth of said nuclei into crystals effective to ceramize the glass.
Claim 7
Dependent Claim
74 words
A process of claim 5 wherein the first temperature/time stage is about 50-100 centigrade degrees above the melting point of the glass for about 5 minutes to about 1 hour, the second temperature/time stage is about 250-350 centigrade degrees below the melting temperature for about 5 minutes to about 2 hours, and the third temperature/ time stage is about 100-300 centigrade degrees above said second temperature for about 5 minutes to about 2 hours.
Claim 8
Dependent Claim
13 words
A process of claim 5 wherein the metal compound is a nickel alloy.
References Cited (Backward Citations)
US2219573A
Cited
US2392314A
Cited
US2876596A
Cited
US2878140A
Cited
US3220815A
Cited
US4032337A
Cited
US4159075A
Cited
US4492737A
Cited
US4485961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |