US5523263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass production method using ilmenite
Assignee: Pilkington North America Inc
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Filing: 1994-08-26
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Granted: 1996-06-04
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Expires: 2014-08-26
Abstract
Abstract A neutral, generally green colored, infrared energy and ultraviolet radiation absorbing glass composition comprises conventional soda-lime-silica float glass ingredients, a relatively high concentration of moderately reduced iron, and titanium oxide(s). The resultant glass exhibits an Illuminant A visible light transmittance of at least 70%, a total solar energy transmittance not greater than about 46%, and an ultraviolet radiation transmittance not greater than approximately 38%, at selected glass thicknesses in the range of 3mm to 5mm. The titanium oxide(s) as well as at least a portion of the iron in the glass is provided by the inclusion of the mineral ilmenite in the glass batch formulation.
Inventors
- 👤 Bret E. Penrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:37
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/082; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C4/02; C03C4/085
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
In a process for producing a ultraviolet radiation absorbing glass containing oxides of iron and titanium, including admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, a source of titanium oxide, sources of iron oxides and a sulfate selected from the group consisting of salt cake and gypsum, the improvement comprising including in said batch ilmenite as the source of the titanium oxide and at least a partial source of the iron oxides in the resulting glass.
Claim 2
Dependent Claim
84 words
In a process for producing a ultraviolet radiation absorbing glass containing oxides of iron and titanium, including admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, a source of titanium oxide, sources of iron oxides and a sulfate selected from the group consisting of salt cake and gypsum, the improvement comprising including in said batch ilmenite as the source of the titanium oxide and at least a partial source of the iron oxides in the resulting glass.
Claim 3
Dependent Claim
17 words
A process as defined in claim 1, wherein said ilmenite contains up to 50% by weight FeO.
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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) | 1999-06-04 | 1999-12-04 | 2000-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-04 | 2003-12-04 | 2004-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-04 | 2007-12-04 | 2008-06-04 | $7700.00 | Window Closed / Lapsed |