US3929494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant for glass-ceramic surfaces
Assignee: OI Glass Inc
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Filing: 1972-12-22
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Granted: 1975-12-30
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Expires: 1992-12-22
Abstract
Abstract A foaming sealant or cement for use in securely joining shaped thermally crystallizable glass bodies and shaped glass-ceramic bodies previously formed by thermal in situ crystallization of thermally crystallizable shaped glass bodies wherein the sealant consists essentially of from (1) about 80-99 percent by weight of a glass frit having SiO2, Al2O3, Li2O and usually CeO2 as the essential ingredients, (2) about 2-15 percent by weight of ZnO powder when the mole percent of the CeO2 in the glass frit is below about 2, and (3) an amount by weight of SiC powder sufficient to be decomposed during the firing of the sealant to form gas which, in turn, foams the sealant. Such sealant can be fired and bonded to shaped glass-ceramic bodies at temperatures below 2192*F and as low as 2150*F and even lower. The sealant is dimensionally stable when subjected to high temperatures over long periods of time and has an average coefficient of thermal expansion of from about -15 X 10 7 up to +10 X 10 7/*C over the range of from 0*-800*C.
Inventors
- 👤 Frank Veres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:50
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C10/00; C03C10/0018; C03C10/0027; C03C11/00; C03C11/007; C04; C04B; C04B37/00; C04B37/003; C04B37/005; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/50; C04B2237/70; C04B2237/704; C04B2237/84
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
203 words
A FOAMING SEALANT FOR SEALING TOGETHER THERMALLY CRYSTALLIZABLE GLASS OR GLASS-CERAMIC BODIES UPON FIRING OF SAID SEALANT, SAID SEALANT CONSISTING ESSENTIALLY OF: A. ABOUT 80-99 WEIGHT PERCENT OF A GLAS FRIT CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT, 54-80 SIO2, 14-32 AL2O3, 3-8 LI2O, 0-9 ZNO AND 0-7 CEO2, WHEREIN THE MOLE RATIO OF (LI2O + ZNO) : AL2O3 IS FROM 0.7 TO 1.2 AND THE MOLAR RATIO OF LI2O : ZNO IS AT LEAST 2, B. ZERO TO 15 WEIGHT PERCENT OF PARTICULATE CEO2, AND C. ZERO TO 6 WEIGHT PERCENT OF PARTICULATE CEO2, AND D. A SUFFICIENT AMOUNT OF PARTICULATE SIC WHICH, UPON FIRING OF SAID SEALANT, WILL DECOMPOSE TO EVOLVE A GAS FOR FOAMING SAID SEALANT DURING SAID FIRING, WHEREIN THE TOTAL ZNO IN THE SEALANT IS NOT OVER 15 WEIGHT PERCENT OF THE SEALANT AND IS AT LEAST 2 WEIGHT PERCENT OF THE SEALANT WHEN THE CEO2 COMPONENT OF GLASS COMPONENT (A) IS LESS THAN 2 MOLE PERCENT THEREOF; AND WHEREIN SAID CEO2 IN SAID SEALANT IS IN AN AMOUNT SUFFICIENT TO EFFECT THE DECOMPOSITION OF THE SAID SIC TO EVOLVE SAID GAS FOR FOAMING SAID SEALANT, SAID AMOUNT OF CEO2 BEING FROM ABOUT 1 TO ABOUT 7 WEIGHT PERCENT.
Claim 2
Dependent Claim
203 words
A FOAMING SEALANT FOR SEALING TOGETHER THERMALLY CRYSTALLIZABLE GLASS OR GLASS-CERAMIC BODIES UPON FIRING OF SAID SEALANT, SAID SEALANT CONSISTING ESSENTIALLY OF: A. ABOUT 80-99 WEIGHT PERCENT OF A GLAS FRIT CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT, 54-80 SIO2, 14-32 AL2O3, 3-8 LI2O, 0-9 ZNO AND 0-7 CEO2, WHEREIN THE MOLE RATIO OF (LI2O + ZNO) : AL2O3 IS FROM 0.7 TO 1.2 AND THE MOLAR RATIO OF LI2O : ZNO IS AT LEAST 2, B. ZERO TO 15 WEIGHT PERCENT OF PARTICULATE CEO2, AND C. ZERO TO 6 WEIGHT PERCENT OF PARTICULATE CEO2, AND D. A SUFFICIENT AMOUNT OF PARTICULATE SIC WHICH, UPON FIRING OF SAID SEALANT, WILL DECOMPOSE TO EVOLVE A GAS FOR FOAMING SAID SEALANT DURING SAID FIRING, WHEREIN THE TOTAL ZNO IN THE SEALANT IS NOT OVER 15 WEIGHT PERCENT OF THE SEALANT AND IS AT LEAST 2 WEIGHT PERCENT OF THE SEALANT WHEN THE CEO2 COMPONENT OF GLASS COMPONENT (A) IS LESS THAN 2 MOLE PERCENT THEREOF; AND WHEREIN SAID CEO2 IN SAID SEALANT IS IN AN AMOUNT SUFFICIENT TO EFFECT THE DECOMPOSITION OF THE SAID SIC TO EVOLVE SAID GAS FOR FOAMING SAID SEALANT, SAID AMOUNT OF CEO2 BEING FROM ABOUT 1 TO ABOUT 7 WEIGHT PERCENT.
Claim 3
Dependent Claim
33 words
The foaming sealant as defined in claim 1 wherein said sealant, after firing, exhibits a change of length of less than 175 parts per million after long exposure to temperatures up to 800*C.
Claim 4
Dependent Claim
33 words
The foaming sealant as defined in claim 2 wherein said sealant, after firing, exhibits a change of length of less than 100 parts per million after long exposure to temperatures up to 800*C.
Claim 5
Dependent Claim
38 words
The foaming sealant as defined in claim 1 wherein said sealant, after firing, has an average coefficient of thermal expansion over the temperature range 0*-800*C of from about -15 X 10 7/*C to about 10 X 10 7*C.
Claim 6
Dependent Claim
30 words
The foaming sealant as defined in claim 4 wherein said average coefficient of thermal expansion is from about -12 to +6 X 10 7/*C over the temperature range of 0800*C.
Claim 7
Dependent Claim
27 words
The sealant as defined in claim 1 wherein said ZnO, if present, has at least a portion thereof present as a part of said glass frit composition.
Claim 8
Dependent Claim
22 words
The sealant as defined in claim 6 wherein all of said ZnO is present as a part of said glass frit composition.
Claim 9
Dependent Claim
16 words
A foaming sealant of claim 1 wherein about 80-97 weight percent thereof is said glass frit.
Claim 10
Dependent Claim
27 words
A foaming sealant of claim 1 wherein SiC is present in said sealant in an amount of about 1 to about 5 weight percent of said sealant.
Claim 11
Dependent Claim
18 words
A foaming sealant of claim 1 wherein at least 1 weight percent of said glass frit is CeO2.
Claim 12
Dependent Claim
18 words
A foaming sealant of claim 1 wherein at least 2 mole percent of said glass frit is CeO2.
Claim 13
Dependent Claim
30 words
The foaming sealant as defined in claim 11 wherein said particulate SiC is present in an amount of from about 1 to about 5 percent by weight of said sealant.
Claim 14
Dependent Claim
199 words
A foaming sealant for sealing together thermally crystallizable glass or glass-ceramic bodies upon firing of said sealant, said sealant consisting essentially of: a. about 80-99 weight percent of a glass frit consisting essentially of, in weight percent, 54-80 SiO2, 14-32 Al2O3, 3-8 Li2O, 0-9 ZnO and about 1-7 CeO2, wherein the mole ratio of (Li2O + ZnO) : Al2O3 is from 0.7 - 1.2 and the molar ratio of Li2O : ZnO is at least 2, b. zero to 15 weight percent of particulate ZnO, c. zero to 6 weight percent of particulate CeO2, and d. a sufficient amount of particulate SiC which, upon firing of said sealant, will decompose to evolve a gas for foaming said sealant during said firing, wherein the total ZnO in the sealant is not over 15 weight percent of the sealant and is at least 2 weight percent of the sealant when the CeO2 component of glass component (a) is less than 2 mole percent thereof; and wherein said CeO2 in said sealant is in an amount sufficient to effect the decomposition of the said SiC to evolve said gas for foaming said sealant, said amount of CeO2 not exceeding 7 weight percent.
Claim 15
Dependent Claim
199 words
A foaming sealant for sealing together thermally crystallizable glass or glass-ceramic bodies upon firing of said sealant, said sealant consisting essentially of: a. about 80-99 weight percent of a glass frit consisting essentially of, in weight percent, 54-80 SiO2, 14-32 Al2O3, 3-8 Li2O, 0-9 ZnO and about 1-7 CeO2, wherein the mole ratio of (Li2O + ZnO) : Al2O3 is from 0.7 - 1.2 and the molar ratio of Li2O : ZnO is at least 2, b. zero to 15 weight percent of particulate ZnO, c. zero to 6 weight percent of particulate CeO2, and d. a sufficient amount of particulate SiC which, upon firing of said sealant, will decompose to evolve a gas for foaming said sealant during said firing, wherein the total ZnO in the sealant is not over 15 weight percent of the sealant and is at least 2 weight percent of the sealant when the CeO2 component of glass component (a) is less than 2 mole percent thereof; and wherein said CeO2 in said sealant is in an amount sufficient to effect the decomposition of the said SiC to evolve said gas for foaming said sealant, said amount of CeO2 not exceeding 7 weight percent.
Claim 16
Dependent Claim
23 words
The foaming sealant as defined in claim 1 wherein said CeO2 is particulate CeO2 admixed with said SiO2 - Al2O3 - Li2O glass.
Claim 17
Dependent Claim
187 words
A foaming sealant for sealing together thermally crystallizable glass or glass-ceramic bodies upon firing of said sealant, said sealant consisting essentially of: a. about 80-99 weight percent of a glass frit consisting essentially of, in weight percent, 54-80 SiO2, 14-32 Al2O3, 3-8 Li2O and 0-9 ZnO and less than 2 mole percent CeO2, wherein the mole ratio of (Li2O + ZnO) : Al2O3 is from 0.7 to 1.2 and the mole ratio of Li2O : ZnO is at least 2, b. zero 15 weight percent of particulate ZnO, c. zero to 6 weight percent of particulate CeO2, and d. a sufficient amount of particulate SiC which, upon firing of said sealant, will decompose to evolve a gas for foaming said sealant during said firing, wherein the total ZnO in the sealant is not over 15 weight percent of the sealant and is at least 2 weight percent of the sealant; and wherein said CeO2 in said sealant is in an amount sufficient to effect the decomposition of the said SiC to evolve said gas for foaming said sealant, said amount of CeO2 not exceeding 7 weight percent.
Claim 18
Dependent Claim
187 words
A foaming sealant for sealing together thermally crystallizable glass or glass-ceramic bodies upon firing of said sealant, said sealant consisting essentially of: a. about 80-99 weight percent of a glass frit consisting essentially of, in weight percent, 54-80 SiO2, 14-32 Al2O3, 3-8 Li2O and 0-9 ZnO and less than 2 mole percent CeO2, wherein the mole ratio of (Li2O + ZnO) : Al2O3 is from 0.7 to 1.2 and the mole ratio of Li2O : ZnO is at least 2, b. zero 15 weight percent of particulate ZnO, c. zero to 6 weight percent of particulate CeO2, and d. a sufficient amount of particulate SiC which, upon firing of said sealant, will decompose to evolve a gas for foaming said sealant during said firing, wherein the total ZnO in the sealant is not over 15 weight percent of the sealant and is at least 2 weight percent of the sealant; and wherein said CeO2 in said sealant is in an amount sufficient to effect the decomposition of the said SiC to evolve said gas for foaming said sealant, said amount of CeO2 not exceeding 7 weight percent.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |