US5013697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing glass compositions
Assignee: Johnson Matthey Inc
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Filing: 1990-06-21
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Granted: 1991-05-07
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Expires: 2010-06-21
Abstract
Abstract A sealing glass composition comprising, in wt. %, 30-70% lead oxide, 30-60% vanadium oxide, 1-10% phosphorous oxide, 0-30% bismuth oxide, 0.5 to 5% niobium oxide, and 1-15% of at least one oxide from the group consisting of tellurium oxide and selenium oxide.
Inventors
- 👤 Masyood Akhtar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
A sealing glass composition for bonding ceramic surfaces which is capable of developing satisfactory bonding strength at firing temperatures of less than 400° C. comprising, in wt. % 18-70% lead oxide, 18-60% vanadium oxide, 1-10% phosphorous oxide, 0-30% bismuth oxide, 1-15% of at least one of the oxides from the group consisting of tellurium oxide and selenium oxide and 0.5 to 5% niobium oxide.
Claim 2
Dependent Claim
64 words
A sealing glass composition for bonding ceramic surfaces which is capable of developing satisfactory bonding strength at firing temperatures of less than 400° C. comprising, in wt. % 18-70% lead oxide, 18-60% vanadium oxide, 1-10% phosphorous oxide, 0-30% bismuth oxide, 1-15% of at least one of the oxides from the group consisting of tellurium oxide and selenium oxide and 0.5 to 5% niobium oxide.
Claim 3
Dependent Claim
18 words
A sealing glass composition according to claim 1 wherein bismuth oxide is present in the amount of 0.7-30%.
Claim 4
Dependent Claim
16 words
A sealing glass composition according to claim 1 wherein phosphorous oxide is present up to 5%.
Claim 5
Dependent Claim
49 words
A sealing glass composition according to claim 1 comprising about 18-55% lead oxide, about 18-55% vanadium oxide, about 1-5% niobium oxide, about 3-5% phosphorous oxide, about 0.7 to 30% bismuth oxide and about 1-15% of at least one oxide from the group consisting of tellurium oxide and selenium oxide.
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |