Patent US5364820A successfully refreshed from Google Patents.
US5364820A
Expired / Lapsed
US
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Neutral gray-colored infrared and ultraviolet radiation absorbing glass
Assignee: Central Glass Co Ltd
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Filing: 1993-03-17
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Granted: 1994-11-15
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Expires: 2013-03-17
Abstract
Abstract An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-74% of SiO2, 0.1-3.0% of Al2O3, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na2O, 0.5-3.0% of K2O, 0.1-0.4% of SO3, 0.10-0.55% of total iron expressed as Fe2O3, 0.2-0.6% of CeO2, 15-35 ppm of CoO and 2-18 ppm of Se. In the glass the ratio of ferrous iron to ferric iron is in the range from 0.17 to 0.55. The glass has a neutral grayish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption, and a sheet of the glass can be easily tempered by a conventional method.
Inventors
- 👤 Shigeki Morimoto
- 👤 Tadashi Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:40
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/085; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/02; C03C4/082; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S501/905
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na 2 O, 0.5-3.0% of K 2 O and 0.1-0.4% of SO 3 , and as coloring components, on a weight basis, 0.33%-0.45% of total iron expressed as Fe 2 O 3 , 0.3-0.6% of CeO 2 , 0.2-0.4% of TiO 2 , 15-30 ppm of CoO and 3-10 ppm of Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.20 to 0.30, that the total of SiO 2 and Al 2 O 3 is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na 2 O and K 2 O is from 12-17%.
Claim 2
Dependent Claim
157 words
A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na 2 O, 0.5-3.0% of K 2 O and 0.1-0.4% of SO 3 , and as coloring components, on a weight basis, 0.33%-0.45% of total iron expressed as Fe 2 O 3 , 0.3-0.6% of CeO 2 , 0.2-0.4% of TiO 2 , 15-30 ppm of CoO and 3-10 ppm of Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.20 to 0.30, that the total of SiO 2 and Al 2 O 3 is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na 2 O and K 2 O is from 12-17%.
Claim 3
Dependent Claim
48 words
A glass according to claim 1, wherein said glass at a thickness of 4 mm is not lower than 70% in visible light transmittance with using the standard illuminant A, from 50 to 74% in total solar radiation transmittance and from 15 to 29% in ultraviolet radiation transmittance.
Claim 4
Dependent Claim
33 words
A glass according to claim 2, wherein said total solar radiation transmittance is in the range from 50 to 71%, and said ultraviolet radiation transmittance is in the range from 15 to 27%.
Claim 5
Dependent Claim
32 words
A glass according to claim 1, wherein said glass at a thickness of 4 mm is from 556 to 582 nm in dominant wavelength and from 0.5 to 7.0 in excitation purity.
Claim 6
Dependent Claim
24 words
A glass according to claim 4, wherein said glass at a thickness of 4 mm is from 560 to 580 nm in dominant wavelength.
Claim 7
Dependent Claim
157 words
A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na 2 O, 0.5-3.0% of K 2 O and 0.1-0.4% of SO 3 , and as coloring components, on a weight basis, 0.25%-0.45% of total iron expressed as Fe 2 O 3 , 0.3-0.6% of CeO 2 , 0.2-0.4% of TiO 2 , 15-30 ppm of CoO and 6-15 ppm of Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.30 to 0.40, that the total of SiO 2 and AL 2 O 3 is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na 2 O and K 2 O is from 12-17%.
Claim 8
Dependent Claim
157 words
A neutral gray-colored infrared and ultraviolet radiation absorbing glass consisting essentially of, as fundamental components, on a weight basis, 68-74% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na 2 O, 0.5-3.0% of K 2 O and 0.1-0.4% of SO 3 , and as coloring components, on a weight basis, 0.25%-0.45% of total iron expressed as Fe 2 O 3 , 0.3-0.6% of CeO 2 , 0.2-0.4% of TiO 2 , 15-30 ppm of CoO and 6-15 ppm of Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.30 to 0.40, that the total of SiO 2 and AL 2 O 3 is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na 2 O and K 2 O is from 12-17%.
Claim 9
Dependent Claim
48 words
A glass according to claim 6, wherein said glass at a thickness of 4 mm is not lower than 70% in visible light transmittance with using the standard illuminant A, from 50 to 74% in total solar radiation transmittance and from 15 to 29% in ultraviolet radiation transmittance.
Claim 10
Dependent Claim
33 words
A glass according to claim 7, wherein said total solar radiation transmittance is in the range from 50 to 71%, and said ultraviolet radiation transmittance is in the range from 15 to 27%.
Claim 11
Dependent Claim
32 words
A glass according to claim 6, wherein said glass at a thickness of 4 mm is from 556 to 582 nm in dominant wavelength and from 0.5 to 7.0 in excitation purity.
Claim 12
Dependent Claim
24 words
A glass according to claim 9, wherein said glass at a thickness of 4 mm is from 560 to 580 nm in dominant wavelength.
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