GB804893A - Glass compositions - Google Patents
Glass compositionsInfo
- Publication number
- GB804893A GB804893A GB30114/56A GB3011456A GB804893A GB 804893 A GB804893 A GB 804893A GB 30114/56 A GB30114/56 A GB 30114/56A GB 3011456 A GB3011456 A GB 3011456A GB 804893 A GB804893 A GB 804893A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- glass
- per cent
- oct
- softening point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
- C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
804,893. Glass. PITTSBURGH PLATE GLASS CO. Oct. 3, 1956 [Oct. 4, 1955], No. 30114/56. Class 56. Glass, particularly for the major segment of a multifocal lens, has the following composition in weight per cent. :- the sum of K 2 O + TiO 2 + Al 2 O 3 being 3-16, and preferably has a softening point below 1250‹F., a refractive index between 1À520 and 1À540, a reciprocal dispersion of 48 to 55 and a coefficient of expansion of approximately 7À0 to 10À0 x 10<SP>-6</SP> per 0‹C. between 25‹C. and 300‹C. Small amounts of fining agents, such as arsenic, or antimony pentoxide up to 2 per cent. by weight, melting aids or colorants, and up to 1 per cent. by weight of fluorine to lower the softening point may be added.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US804893XA | 1955-10-04 | 1955-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB804893A true GB804893A (en) | 1958-11-26 |
Family
ID=22157707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30114/56A Expired GB804893A (en) | 1955-10-04 | 1956-10-03 | Glass compositions |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE551482A (en) |
| DE (1) | DE1022765B (en) |
| GB (1) | GB804893A (en) |
-
0
- BE BE551482D patent/BE551482A/xx unknown
-
1956
- 1956-10-03 GB GB30114/56A patent/GB804893A/en not_active Expired
- 1956-10-04 DE DEP17121A patent/DE1022765B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1022765B (en) | 1958-01-16 |
| BE551482A (en) |
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