Patent US5523263A successfully refreshed from Google Patents.
US5523263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass production method using ilmenite
Assignee: Pilkington North America Inc
•
Filing: 1994-08-26
•
Granted: 1996-06-04
•
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 02:49
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.
References Cited (Backward Citations)
US4331770A
Cited
US4866010A
Cited
US4792536A
Cited
US5112778A
Cited
US5077133A
Cited
US5362689A
Cited
EP0488110A1
Cited
US5070048A
Cited
US5344798A
Cited
US5320986A
Cited
US5380685A
Cited
US5364820A
Cited
US5214008A
Cited
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 |