Patent US4149896A successfully refreshed from Google Patents.
US4149896A
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Phototropic glass for multifocal spectacle-glasses
Assignee: Schott AG
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Filing: 1978-06-28
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Granted: 1979-04-17
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Expires: 1998-06-28
Abstract
Abstract Glasses are provided which may be made phototropic and which have a thermal coefficient of linear expansion between about 43 and 58×10 -7 /° C. and an index of refraction n d over about 1.60. Such glasses can be employed as near portion glass material in spectacle lens manufacture; thus, such glasses can be fused with known phototropic for portion glass material, for example, of the borosilicate type, to make multifocal glasses useful in spectacle lenses and spectacles.
Inventors
- 👤 Marga Faulstich
- 👤 Georg Gliemeroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C4/00; C03C4/04; C03C4/06; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; G02C; G02C7/00; G02C7/02; G02C7/06; G02C7/10; G02C7/102; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
439 words
A phototropic glass adapted for use as a near portion material in a multifocal glass system, said glass being characterized by having a thermal coefficient of linear expansion between 43 and 58×10 -7 /° C. and by having an index of refraction n d over 1.60, said glass comprising on a 100 weight percent total starting composition basis a heat fused, blended mixture of: from about 5 to 30% by weight of SiO 2 from about 7 to 35% by weight of B 2 O 3 from about 6 to 26% by weight of PbO from and including 0 to about 15% by weight of ZnO from about 12 to 30% by weight of La 2 O 3 from about 12 to 25% by weight of Al 2 O 3 from and including 0 to about 6% by weight of ZrO 2 from and including 0 to about 3% by weight of TiO 2 from and including 0 to about 2% by weight of K 2 O from and including 0 to about 2% by weight of Na 2 O from and including 0 to about 4% by weight of Li 2 O from about 0.1 to 1.8% by weight of Ag 2 O from and including 0 to about 0.05% by weight of CuO, from and including 0 to about 0.01% by weight of CoO, from and including 0 to about 0.54% by weight of As 2 O 3 +Sb 2 O 3 , a total content from and including 0 to about 5% by weight of the oxides of Bi, Ta, Nb and W, provided that, in such a composition, the following anion-portions have replaced the oxygen in the respective indicated amounts: from about 0.2 to 4.5% by weight of Cl from and including 0 to about 4.0% by weight of Br plus I from and including 0 to about 4.0% by weight of F, and further provided that the following compositional limits are maintained: the total content of B 2 O 3 , SiO 2 and alkaline earth oxides is between about 30 and 45% by weight the total content of alkali oxides ranges from about 0.2 to 8% by weight, the total content of Al 2 O 3 and La 2 O 3 ranges from about 24 to 54% by weight, the total content of alkaline earth oxides ranges from and including 0 to about 6.51% by weight with the maximum quantity of any MgO present being kept below about 5.0% by weight, and the total content of ZnO plus ZrO 2 plus TiO 2 ranges from and including 0 to about 25% by weight.
Claim 2
Dependent Claim
439 words
A phototropic glass adapted for use as a near portion material in a multifocal glass system, said glass being characterized by having a thermal coefficient of linear expansion between 43 and 58×10 -7 /° C. and by having an index of refraction n d over 1.60, said glass comprising on a 100 weight percent total starting composition basis a heat fused, blended mixture of: from about 5 to 30% by weight of SiO 2 from about 7 to 35% by weight of B 2 O 3 from about 6 to 26% by weight of PbO from and including 0 to about 15% by weight of ZnO from about 12 to 30% by weight of La 2 O 3 from about 12 to 25% by weight of Al 2 O 3 from and including 0 to about 6% by weight of ZrO 2 from and including 0 to about 3% by weight of TiO 2 from and including 0 to about 2% by weight of K 2 O from and including 0 to about 2% by weight of Na 2 O from and including 0 to about 4% by weight of Li 2 O from about 0.1 to 1.8% by weight of Ag 2 O from and including 0 to about 0.05% by weight of CuO, from and including 0 to about 0.01% by weight of CoO, from and including 0 to about 0.54% by weight of As 2 O 3 +Sb 2 O 3 , a total content from and including 0 to about 5% by weight of the oxides of Bi, Ta, Nb and W, provided that, in such a composition, the following anion-portions have replaced the oxygen in the respective indicated amounts: from about 0.2 to 4.5% by weight of Cl from and including 0 to about 4.0% by weight of Br plus I from and including 0 to about 4.0% by weight of F, and further provided that the following compositional limits are maintained: the total content of B 2 O 3 , SiO 2 and alkaline earth oxides is between about 30 and 45% by weight the total content of alkali oxides ranges from about 0.2 to 8% by weight, the total content of Al 2 O 3 and La 2 O 3 ranges from about 24 to 54% by weight, the total content of alkaline earth oxides ranges from and including 0 to about 6.51% by weight with the maximum quantity of any MgO present being kept below about 5.0% by weight, and the total content of ZnO plus ZrO 2 plus TiO 2 ranges from and including 0 to about 25% by weight.
Claim 3
Dependent Claim
443 words
A phototropic lens blank adapted for use as a near portion fusion material in a multifocal lens system, said lens blank being characterized by having a thermal coefficient of linear expansion between 43 and 58×10 -7 /° C. and by having an index of refraction n d over 1.60, said lens blank comprising on a 100 weight percent total starting composition basis a heat fused, blended mixture of: from about 5 to 30% by weight of SiO 2 from about 7 to 35% by weight of B 2 O 3 from about 6 to 26% by weight of PbO from and including 0 to about 0.54% by weight of AS 2 O 3 +Sb 2 O 3 , a total content from and including 0 to about 5% by weight of the oxides of Bi, Ta, Nb and W, from and including 0 to about 15% by weight of Zno from about 12 to 30% by weight of La 2 O 3 from about 12 to 25% by weight of Al 2 O 3 from and including 0 to about 6% by weight of ZrO 2 from and including 0 to about 3% by weight of TiO 2 from and including 0 to 2% by weight of K 2 O from and including 0 to about 2% by weight of Na 2 O from and including 0 to about 4% by weight of Li 2 O from about 0.1 to 1.8% by weight of Ag 2 O from and including 0 to about 0.05% by weight of CuO, and from and including 0 to about 0.01% by weight of CoO, provided that, in such a composition, the following anion-portions have replaced the oxygen in the respective indicated amounts: from about 0.2 to 4.5% by weight of Cl from and including 0 to about 4.0% by weight of Br plus I, and from and including 0 to about 4.0% by weight of F, and further provided that the following compositional limits are maintained: the total content of B 2 O 3 , SiO 2 and alkaline earth oxide is between 30 and 45% by weight, the total content of alkali oxides ranges from about 0.2 to 8% by weight, the total content of Al 2 O 3 and La 2 O 3 ranges from about 24 to 54% by weight, the total content of alkaline earth oxides ranges from and including 0 to about 6.51% by weight with the maximum quantity of any MgO present being kept below about 5.0% by weight, and the total content of ZnO plus ZrO 2 plus TiO 2 ranges from and including 0 to about 25% by weight.
Claim 4
Dependent Claim
443 words
A phototropic lens blank adapted for use as a near portion fusion material in a multifocal lens system, said lens blank being characterized by having a thermal coefficient of linear expansion between 43 and 58×10 -7 /° C. and by having an index of refraction n d over 1.60, said lens blank comprising on a 100 weight percent total starting composition basis a heat fused, blended mixture of: from about 5 to 30% by weight of SiO 2 from about 7 to 35% by weight of B 2 O 3 from about 6 to 26% by weight of PbO from and including 0 to about 0.54% by weight of AS 2 O 3 +Sb 2 O 3 , a total content from and including 0 to about 5% by weight of the oxides of Bi, Ta, Nb and W, from and including 0 to about 15% by weight of Zno from about 12 to 30% by weight of La 2 O 3 from about 12 to 25% by weight of Al 2 O 3 from and including 0 to about 6% by weight of ZrO 2 from and including 0 to about 3% by weight of TiO 2 from and including 0 to 2% by weight of K 2 O from and including 0 to about 2% by weight of Na 2 O from and including 0 to about 4% by weight of Li 2 O from about 0.1 to 1.8% by weight of Ag 2 O from and including 0 to about 0.05% by weight of CuO, and from and including 0 to about 0.01% by weight of CoO, provided that, in such a composition, the following anion-portions have replaced the oxygen in the respective indicated amounts: from about 0.2 to 4.5% by weight of Cl from and including 0 to about 4.0% by weight of Br plus I, and from and including 0 to about 4.0% by weight of F, and further provided that the following compositional limits are maintained: the total content of B 2 O 3 , SiO 2 and alkaline earth oxide is between 30 and 45% by weight, the total content of alkali oxides ranges from about 0.2 to 8% by weight, the total content of Al 2 O 3 and La 2 O 3 ranges from about 24 to 54% by weight, the total content of alkaline earth oxides ranges from and including 0 to about 6.51% by weight with the maximum quantity of any MgO present being kept below about 5.0% by weight, and the total content of ZnO plus ZrO 2 plus TiO 2 ranges from and including 0 to about 25% by weight.
References Cited (Backward Citations)
US3765913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |