Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A substantially transparent glass-ceramic article containing mullite as the predominant crystal phase which can be prepared from a precursor glass capable of being melted at temperatures no higher than 1650° C. and which can be crystallized at high viscosities, i.e., about 10 9 -10 12 poises, said glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of 40-60% SiO 2 , 12-30% B 2 O 3 , 17.5-27.5% Al 2 O 3 , and 3-13% Na 2 O and/or K 2 O, and wherein the mole ratio Al 2 O 3 :Na 2 O+K 2 O 1.75.
Claim 2
Dependent Claim
102 words
A substantially transparent glass-ceramic article containing mullite as the predominant crystal phase which can be prepared from a precursor glass capable of being melted at temperatures no higher than 1650° C. and which can be crystallized at high viscosities, i.e., about 10 9 -10 12 poises, said glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of 40-60% SiO 2 , 12-30% B 2 O 3 , 17.5-27.5% Al 2 O 3 , and 3-13% Na 2 O and/or K 2 O, and wherein the mole ratio Al 2 O 3 :Na 2 O+K 2 O 1.75.
Claim 3
Dependent Claim
118 words
A substantially transparent glass-ceramic article containing mullite as the predominant crystal phase which can be prepared from a precursor glass capable of being melted at temperatures no higher than 1650° C. and which can be crystallized in situ at high viscosities, i.e., about 10 9 -10 12 poises, said glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of 15-45% SiO 2 , 20-30% B 2 O 3 , 20-40% Al 2 O 3 , and 5-30% RO, wherein RO consists of at least one member of the group in the indicated proportions of 0-15% MgO, 0-20% CaO, 0-30% SrO, and 0-30% BaO, and wherein the mole ratio Al 2 O 3 :RO<1.75.
Claim 4
Dependent Claim
118 words
A substantially transparent glass-ceramic article containing mullite as the predominant crystal phase which can be prepared from a precursor glass capable of being melted at temperatures no higher than 1650° C. and which can be crystallized in situ at high viscosities, i.e., about 10 9 -10 12 poises, said glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of 15-45% SiO 2 , 20-30% B 2 O 3 , 20-40% Al 2 O 3 , and 5-30% RO, wherein RO consists of at least one member of the group in the indicated proportions of 0-15% MgO, 0-20% CaO, 0-30% SrO, and 0-30% BaO, and wherein the mole ratio Al 2 O 3 :RO<1.75.
Claim 5
Dependent Claim
28 words
A glass-ceramic according to claim 1 also containing up to 1% total of transition metal oxides and/or up to 5% total of rare earth metal oxides as colorants.
Claim 6
Dependent Claim
28 words
A glass-ceramic according to claim 2 also containing up to 1% total of transition metal oxides and/or up to 5% total of rare earth metal oxides as colorants.
Claim 7
Dependent Claim
55 words
A glass-ceramic according to claim 1, which, also containing 0.01-1% Cr 2 O 3 , demonstrates broad absorption over the visible region of the radiation spectrum, strong fluorescence in the red and near infrared portions of the spectrum when exposed to ultraviolet and/or visible radiation, and relatively little overlap of the absorption and fluorescent spectra.
Claim 8
Dependent Claim
55 words
A glass-ceramic according to claim 2 which, also containing 0.01-1% Cr 2 O 3 , demonstrates broad absorption over the visible region of the radiation spectrum, strong fluorescence in the red and near infrared portions of the spectrum when exposed to ultraviolet and/or visible radiation, and relatively little overlap of the absorption and fluorescent spectra.