US4366253A
Expired / Lapsed
US
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Phosphate glass compositions, and glass-ceramic materials, and methods of making the same
Assignee: Fujifilm Holdings Corp
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Filing: 1980-08-11
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Granted: 1982-12-28
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Expires: 2000-08-11
Abstract
Abstract Phosphate glass compositions are described comprising from 8 to 35 wt % P 2 O 5 , from 8 to 48 wt % SiO 2 and GeO 2 , provided that the GeO content is not more than 6 wt %, from 3 to 18 wt % B 2 O 3 , from 16 to 28 wt % Al 2 O 3 , and from 8 to 33 wt % CaO, MgO, SrO, and BaO, provided that the sum of the MgO, SrO, and BaO contents is not more than 15 wt %, and wherein the sum of the above-described oxides comprises at least 88 wt % of the total composition and the ratio of the sum of the CaO, MgO, SrO and BaO contents to the P 2 O 5 content ranges from 0.6/1 to 1.4/1 and wherein the amount of alkali metal oxide is less than 1%, certain of said compositions can be converted to a glass-ceramic material by a thermal treatment for crystallization which includes the steps, in sequence, of (1) melting a glass composition, (2) molding the melted glass composition, (3) cooling the resulting molded composition to its transformation temperature or less, and (4) allowing phosphate crystal to separate out as a main crystal phase by a re-heating treatment under conditions such that the molded shape is retained.
Inventors
- 👤 Motohiko Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:51
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C10/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
257 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of from 8 to 35 wt% P 2 O 5 , from 8 to 48 wt% SiO 2 and GeO 2 , provided that the GeO 2 content is not more than 6 wt%, from 3 to 18 wt% B 2 O 3 , from 16 to 28 wt% Al 2 O 3 , and from 8 to 33 wt% CaO, MgO, SrO, and BaO, provided that the sum of the MgO, SrO, and BaO contents is not more than 15 wt%, and 0 to 12 wt% of a metal or metal oxide nucleating agent selected from the group consisting of TiO 2 , ZrO 2 , CeO 2 , Au and Ag, and further wherein the ratio of the amount of CaO to the sum of the amount of CaO, MgO, SrO and BaO is more than 58 wt% and the ratio of the sum of the CaO, MgO, SrO and BaO contents to the P 2 O 5 content ranges from 1.02/1 to 1.4/1 and wherein the amount of the alkali metal oxide is less than 1%, said phosphate glass composition yielding a transparent glass which is characterized by a specific gravity ranging from about 2.5 to about 2.9, a dilatometric transformation temperature ranging from about 450° C. to about 750° C. and an average linear coefficient of thermal expansion in the temperature range of 100° C. to 300° C. ranging from about 40×10 -7 to about 90×10 -7 cm/cm°C.
Claim 2
Dependent Claim
257 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of from 8 to 35 wt% P 2 O 5 , from 8 to 48 wt% SiO 2 and GeO 2 , provided that the GeO 2 content is not more than 6 wt%, from 3 to 18 wt% B 2 O 3 , from 16 to 28 wt% Al 2 O 3 , and from 8 to 33 wt% CaO, MgO, SrO, and BaO, provided that the sum of the MgO, SrO, and BaO contents is not more than 15 wt%, and 0 to 12 wt% of a metal or metal oxide nucleating agent selected from the group consisting of TiO 2 , ZrO 2 , CeO 2 , Au and Ag, and further wherein the ratio of the amount of CaO to the sum of the amount of CaO, MgO, SrO and BaO is more than 58 wt% and the ratio of the sum of the CaO, MgO, SrO and BaO contents to the P 2 O 5 content ranges from 1.02/1 to 1.4/1 and wherein the amount of the alkali metal oxide is less than 1%, said phosphate glass composition yielding a transparent glass which is characterized by a specific gravity ranging from about 2.5 to about 2.9, a dilatometric transformation temperature ranging from about 450° C. to about 750° C. and an average linear coefficient of thermal expansion in the temperature range of 100° C. to 300° C. ranging from about 40×10 -7 to about 90×10 -7 cm/cm°C.
Claim 3
Dependent Claim
43 words
A phosphate glass composition as in claim 1 containing from 8 to 38 wt% SiO 2 and GeO 2 , provided that the GeO 2 content is not more than 6 wt%, and from 3 to 10 wt% B 2 O 3 .
Claim 4
Dependent Claim
37 words
A phosphate glass composition as in claim 1 or 2 wherein TiO 2 is the nucleating agent and it is present in an amount of up to 12 wt% based on the total composition of said glass.
Claim 5
Dependent Claim
37 words
A phosphate glass composition as in claim 1 or 2 wherein ZrO 2 is the nucleating agent and it is present in an amount of up to 6 wt% based on the total composition of said glass.
Claim 6
Dependent Claim
15 words
A phosphate glass composition as in claim 1 or 2 further containing a coloring agent.
Claim 7
Dependent Claim
17 words
A phosphate glass composition as in claim 1 further containing a dopant which provides a fluorescence property.
Claim 8
Dependent Claim
36 words
A phosphate glass composition as in claim 1 or 2 wherein gold is the nucleating agent and it is present in an amount of up to 0.02 wt% based on the total composition of said glass.
Claim 9
Dependent Claim
36 words
A phosphate glass composition as in claim 1 or 2 wherein silver is the nucleating agent and it is present in an amount of up to 0.1 wt% based on the total composition of said glass.
Claim 10
Dependent Claim
37 words
A phosphate glass composition as in claim 1 or 2 wherein CeO 2 is the nucleating agent and it is present in an amount of up to 3 wt% based on the total composition of said glass.
Claim 11
Dependent Claim
51 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of 32.7 wt% P 2 O 5 , 9 wt% SiO 2 , 4.5 wt% B 2 O 3 , 22.5 wt% Al 2 O 3 , 25.8 wt% CaO and 5.4 wt% TiO 2 .
Claim 12
Dependent Claim
51 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of 32.7 wt% P 2 O 5 , 9 wt% SiO 2 , 4.5 wt% B 2 O 3 , 22.5 wt% Al 2 O 3 , 25.8 wt% CaO and 5.4 wt% TiO 2 .
Claim 13
Dependent Claim
45 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of 34.6 wt% P 2 O 5 , 9.5 wt% SiO 2 , 4.8 wt% B 2 O 3 , 23.8 wt% Al 2 O 3 and 27.3 wt% CaO.
Claim 14
Dependent Claim
45 words
A phosphate glass composition capable of melting at about 1500° C. or lower consisting essentially of 34.6 wt% P 2 O 5 , 9.5 wt% SiO 2 , 4.8 wt% B 2 O 3 , 23.8 wt% Al 2 O 3 and 27.3 wt% CaO.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |