US4022627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallizable glasses and nephetine glass-ceramics containing ZrO2 and ZnO
Assignee: OI Glass Inc
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Filing: 1971-04-06
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Granted: 1977-05-10
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Expires: 1991-04-06
Abstract
Abstract A thermally crystallizable glass consisting essentially of 45-57 SiO2, 29-38 Al2O3, 13-22 Na2O, in parts by weight, and the parts totalling 100. For each of these 100 parts, the glass contains 0.5-5 parts of ZrO2 and 1-10 parts of ZnO. The five constituents constitute at least 95 weight percent of the total glass and a thermally crystallized glass-ceramic article suitable as kitchen ware or table ware is made from this glass.
Inventors
- 👤 Megumi Tashiro
- 👤 Masamichi Wada
- 👤 Toshio Yamanaka
- 👤 Kenichi Tani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:09
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; C03C10/0009; C03C10/0018; C03C17/00; C03C17/02; C03C8/00; C03C8/02; C03C8/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A thermally crystallizable glass consisting essentially of 45-57 parts SiO 2 , 29-38 parts Al 2 O 3 , 13-22 parts Na 2 O, said parts being based on 100 parts of Sio 2 , Al 2 O 3 and Na 2 O, and for each 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, 0.5-5 arts of ZrO 2 and 1-10 parts of ZnO, wherein said essential SiO 2 , Al 2 O 3 , Na 2 O, ZrO 2 , and ZnO constituents constitute at least 95 weight percent of the total glass, additionally containing 0-3 parts by weight of TiO 2 for each 100 parts by weight of SiO 2 + Al 2 O 3 + Na 2 O, the total of the weight percent ZrO 2 + the weight percent TiO 2 being at least 3.5 based on the total glass composition, said glass being capable of in situ thermal crystallization to form a glass ceramic containing nepheline crystals.
Claim 2
Dependent Claim
168 words
A thermally crystallizable glass consisting essentially of 45-57 parts SiO 2 , 29-38 parts Al 2 O 3 , 13-22 parts Na 2 O, said parts being based on 100 parts of Sio 2 , Al 2 O 3 and Na 2 O, and for each 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, 0.5-5 arts of ZrO 2 and 1-10 parts of ZnO, wherein said essential SiO 2 , Al 2 O 3 , Na 2 O, ZrO 2 , and ZnO constituents constitute at least 95 weight percent of the total glass, additionally containing 0-3 parts by weight of TiO 2 for each 100 parts by weight of SiO 2 + Al 2 O 3 + Na 2 O, the total of the weight percent ZrO 2 + the weight percent TiO 2 being at least 3.5 based on the total glass composition, said glass being capable of in situ thermal crystallization to form a glass ceramic containing nepheline crystals.
Claim 3
Dependent Claim
160 words
A glass-ceramic containing nepheline crystals formed by thermal crystallization of a glass consisting essentially of in parts by weight 45-57 SiO 2 , 29-38 Al 2 O 3 , 13-22 Na 2 O, said parts being based on 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, and for each 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, 0.5-5 parts of ZrO 2 and 1-10 parts of ZnO, wherein said essential SiO 2 , Al 2 O 3 , Na 2 O, ZrO 2 and ZnO constituents constitute at least 95 weight percent of the total glass-ceramics, and additionally containing 0-3 parts by weight of TiO 2 for each 100 parts by weight of SiO 2 + Al 2 O 3 + Na 2 O, the total of the weight percent ZrO 2 + the weight percent TiO 2 being at least 3.5, based on the total glass composition.
Claim 4
Dependent Claim
160 words
A glass-ceramic containing nepheline crystals formed by thermal crystallization of a glass consisting essentially of in parts by weight 45-57 SiO 2 , 29-38 Al 2 O 3 , 13-22 Na 2 O, said parts being based on 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, and for each 100 parts of SiO 2 , Al 2 O 3 and Na 2 O, 0.5-5 parts of ZrO 2 and 1-10 parts of ZnO, wherein said essential SiO 2 , Al 2 O 3 , Na 2 O, ZrO 2 and ZnO constituents constitute at least 95 weight percent of the total glass-ceramics, and additionally containing 0-3 parts by weight of TiO 2 for each 100 parts by weight of SiO 2 + Al 2 O 3 + Na 2 O, the total of the weight percent ZrO 2 + the weight percent TiO 2 being at least 3.5, based on the total glass composition.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |