Lithium containing glass with high oxidized iron content and having specified base, colorant, and oxidizer
US-9658437-B2 · May 23, 2017 · US
Method of changing glass to high infrared absorbing glass having high oxidized iron content
US11150389B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11150389-B2 |
| Application number | US-202016781567-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 4, 2020 |
| Priority date | Feb 24, 2012 |
| Publication date | Oct 19, 2021 |
| Grant date | Oct 19, 2021 |
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Abstract
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A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt %, more preferably 0.001-0.010 wt %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-010. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a high infrared absorbing lithium glass having FeO in the range of 0.02 to 0.04 wt % and a redox ratio in the range of 0.2 to 0.4 to the low infrared absorbing lithium glass by adding additional oxidizers to the batch materials. A second method is provided to change a glass making process from making a low infrared absorbing lithium glass to the high infrared absorbing lithium glass by adding additional reducers to the batch material. In one embodiment of the invention the oxidizer is CeO 2 . An embodiment of the invention covers a glass made according to the method.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of changing molten glass in a furnace from a molten low infrared absorbing glass composition having FeO in the range of 0.0005 to 0.015 wt %, and a redox ratio in the range of 0.005 to 0.15 to a high infrared absorbing glass composition having FeO in the range of 0.02 to 0.05 wt % and a redox ratio in the range of 0.2 to 0.4, comprising: feeding low infrared absorbing glass batch material and a predetermined amount of a first reducing agent to increase the FeO to provide the molten high infrared absorbing glass composition; and ceasing the practice of the preceding step after a predetermined period of time. 2. The method according to claim 1 , wherein after the step of feeding the glass batch material, the method further comprises adding a second reducing agent to the low infrared absorbing glass batch material in an amount in the range of one to two times the amount of the first reducing agent for a predetermined period of time to increase the FeO in the molten glass in the furnace. 3. The method according to claim 1 , wherein the first reducing agent comprises elemental carbon, graphite, sucrose, coal, elemental silicon and/or tin oxide. 4. The method according to claim 2 , wherein at least one of the first reducing agent and the second reducing agent comprises elemental carbon, graphite, sucrose, coal, elemental silicon and/or tin oxide.
Assignees
Inventors
Classifications
comprising at least two glass sheets, only one of which being an outer layer · CPC title
containing SiO2, Al2O3, Li2O as main constituents · CPC title
- G02B5/226Primary
Glass filters · CPC title
for infrared absorbing glass · CPC title
- C03C3/083Primary
containing aluminium oxide or an iron compound · CPC title
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- What does patent US11150389B2 cover?
- A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt %, more preferably 0.001-0.010 wt %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-010. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a h…
- Who is the assignee on this patent?
- Ppg Ind Ohio Inc
- What technology area does this patent fall under?
- Primary CPC classification G02B5/226. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 19 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).