Patent US5478783A successfully refreshed from Google Patents.
US5478783A
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Glass compositions
Assignee: Pilkington Group Ltd
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Filing: 1994-08-03
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Granted: 1995-12-26
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Expires: 2014-08-03
Abstract
Abstract An infrared and ultraviolet absorbing soda-lime-silica glass of a neutral tint containing 0.3% to 0.7% by weight total iron expressed as Fe2O3, together with amounts of Se, Co3O4 and a ferrous iron content to provide a ratio of ferrous iron to total iron in the range of 21 to 34. NiO and TiO2 may be added to the glass. The resultant glass, in a nominal 4 mm thickness, has a visible light transmission of at least 70% and a direct solar heat transmission at least 12 percentage points below the visible light transmission. The iron in the glass is preferably provided by the inclusion of the mineral wuestite in the glass batch formulation.
Inventors
- 👤 Paige L. Higby
- 👤 Bret E. Penrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:26
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C4/00; C03C4/02; C03C4/08; C03C4/082; C03C4/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
In a process for producing an IR and UV absorbing soda-lime-silica glass of a neutral tint containing oxides of iron and cobalt and having a ferrous iron to total iron (as Fe 2 O 3 ) ratio in the range of 21 to 34, including admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, and a sulfate selected from the group consisting of salt cake and gypsum, the improvement comprising including in said batch wuestite as at least a partial source of the iron oxides in the resulting glass.
Claim 2
Dependent Claim
96 words
In a process for producing an IR and UV absorbing soda-lime-silica glass of a neutral tint containing oxides of iron and cobalt and having a ferrous iron to total iron (as Fe 2 O 3 ) ratio in the range of 21 to 34, including admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, and a sulfate selected from the group consisting of salt cake and gypsum, the improvement comprising including in said batch wuestite as at least a partial source of the iron oxides in the resulting glass.
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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) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |