Back to results
US 8,507,394 B2Granted
Glass composition
AssigneeKabushiki Kaisha Ohara
InventorKoji Shimizu
Life of this patent
Estimating the term…
Abstract
There is provided a glass composition having a devitrification temperature of 1000° C. or below, a glass transformation temperature (Tg) of 535° C. or below and a specific gravity within a range from 3 to 4. The glass composition has a refractive index (nd) within a range from 1.60 to 1.75 and an Abbe number (νd) within a range from 50 to 60.
Claims13
A glass composition having a devitrification temperature of 1000° C. or below, a glass transformation temperature (Tg) of 535° C. or below and a specific gravity within a range from 3 to 4 and comprising, in mass % calculated on oxide basis:
- SiO2
- 5-18%,
- B2O3
- 22-40%,
- La2O3
- 10-20%,
- ZrO2
- 0.5-7%,
- SrO
- 0.5-15%,
- Li2O
- 2.5-13%, and
- Gd2O3
- 12.5-30%
- TiO2
- 0-3%.
13 more elements
Dependencies are inferred from the claim text.