US3888686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing glass compositions containing calcined zirconia vanadia silica stain
Assignee: OI Glass Inc
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Filing: 1972-06-19
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Granted: 1975-06-10
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Expires: 1992-06-19
Abstract
Abstract Novel compositions of matter consisting of thermally crystallizable lead borosilicate and lead-zinc-borate sealing glasses having homogeneously blended therein a calcined zirconia vanadia silica stain.
Inventors
- 👤 James L Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:31
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
AN IMPROVED THERMALLY CRYSTALLIZABLE FUSION-TYPE SEALING GLASS COMPOSITION OF MATTER WHEREIN SAID COMPOSITION CONSISTS ESSENTIALLY OF A BASE SEALING GLASS SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF LEAS-ZINC-BORATE AND LEAD-BOROSILICATE SEALING GLASSES AND WHEREIN SAID BASE SEALING GLASS HAS HOMOGRNEOUSLY BLENDED WHEREIN ABOUT 2 TO 18 PERCENT BY WEIGHT OF A CALCINED ZIRCONIA VANADIA SILICA STAIN, SAID RESULTING FUSIONTYPE SEALING GLASS HAVING THEREBY A THERMAL COEFFICIENT OF EXPANSION IN THE DEVITRIFIED STATE RANGING FROM ABOUT 5X10**-7/*C (0*-300*C) TO 20X10**-7/*C (0*-3000*C) LOWER THAN THE SAME GLASS IN THE DEVITRIFIED STATE WOULD HAVE IN THE ABSENCE OF THE CALCINED ZIRCONIA VANADIA SILICA STAIN.
Claim 2
Dependent Claim
101 words
AN IMPROVED THERMALLY CRYSTALLIZABLE FUSION-TYPE SEALING GLASS COMPOSITION OF MATTER WHEREIN SAID COMPOSITION CONSISTS ESSENTIALLY OF A BASE SEALING GLASS SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF LEAS-ZINC-BORATE AND LEAD-BOROSILICATE SEALING GLASSES AND WHEREIN SAID BASE SEALING GLASS HAS HOMOGRNEOUSLY BLENDED WHEREIN ABOUT 2 TO 18 PERCENT BY WEIGHT OF A CALCINED ZIRCONIA VANADIA SILICA STAIN, SAID RESULTING FUSIONTYPE SEALING GLASS HAVING THEREBY A THERMAL COEFFICIENT OF EXPANSION IN THE DEVITRIFIED STATE RANGING FROM ABOUT 5X10**-7/*C (0*-300*C) TO 20X10**-7/*C (0*-3000*C) LOWER THAN THE SAME GLASS IN THE DEVITRIFIED STATE WOULD HAVE IN THE ABSENCE OF THE CALCINED ZIRCONIA VANADIA SILICA STAIN.
Claim 3
Dependent Claim
24 words
The improved sealing glass composition according to claim 1 wherein the calcined stain lowers the crystallization temperature of the sealing glass 10* to 15*C.
Claim 4
Dependent Claim
76 words
The improved sealing glass composition according to claim 1 wherein said lead-zinc-borate sealing glass consists essentially of 70 to 85 weight percent PbO, 6 to 15 weight percent ZnO, 7; to 10 weight percent B2O3 and 0 to 5 weight percent SiO2 and the lead borosilicate sealing glass consists essentially of 70 to 85 weight percent PbO, 7 to 15 weight percent B2O3, 2 to 10 weight percent SiO2 and 1 to 5 weight percent Al2O3.
Claim 5
Dependent Claim
29 words
The improved sealing glass composition acccording to claim 1, wherein said base sealing glass has homogeneously blended therein about 8% by weight of a calcined zirconia vanadia silica stain.
References Cited (Backward Citations)
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US3179739A
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US3228548A
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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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |