Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A low alkali, high phosphate and high Al 2 O 3 content glass suitable for optical colored and filter glasses characterized by having a glass transformation temperature Tg>450° C. and consisting essentially of the following composition, in percent by weight: ______________________________________
P.sub.2 O.sub.5 71.0-76.0
SiO.sub.2 0.25-2.5
B.sub.2 O.sub.3 2.4-3.75
Al.sub.2 O.sub.3 8.6-11.6
R.sub.2 O (alkali oxide)
1.25-6.5
CaO 0.5-1.65
MgO 2.0-3.5
Refining Agent 0.2-0.6
CeO.sub.2 0.1-0.4
F' 0.2-0.4 and
CuO 1.0-10.0.
______________________________________
Claim 2
Dependent Claim
72 words
A low alkali, high phosphate and high Al 2 O 3 content glass suitable for optical colored and filter glasses characterized by having a glass transformation temperature Tg>450° C. and consisting essentially of the following composition, in percent by weight: ______________________________________
P.sub.2 O.sub.5 71.0-76.0
SiO.sub.2 0.25-2.5
B.sub.2 O.sub.3 2.4-3.75
Al.sub.2 O.sub.3 8.6-11.6
R.sub.2 O (alkali oxide)
1.25-6.5
CaO 0.5-1.65
MgO 2.0-3.5
Refining Agent 0.2-0.6
CeO.sub.2 0.1-0.4
F' 0.2-0.4 and
CuO 1.0-10.0.
______________________________________
Claim 3
Dependent Claim
34 words
A composition according to claim 1, containing ______________________________________
Na.sub.2 O 0.25-1.1
K.sub.2 O 1.00-4.85
Li.sub.2 O 0.-1.2
BaO 0.-2.0
SrO 0.-2.0
ZnO 0.-1.75 and
As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3
+ Sb.sub.2 O.sub.5 0.2-0.6.
______________________________________
Claim 4
Dependent Claim
58 words
A composition according to claim 1 having nd= 1.5309 and Tg=485° C., consisting essentially of the following ingredients: ______________________________________
P.sub.2 O.sub.5
72.90
SiO.sub.2
0.50
B.sub.2 O.sub.3
3.40
Al.sub.2 O.sub.3
8.70
Na.sub.2 O
1.05
K.sub.2 O
4.30
Li.sub.2 O
0.45
CaO 0.55
MgO 2.90
As.sub.2 O.sub.3
0.45
CeO.sub.2
0.20
F' 0.25
CuO 1.90
BaO 1.30 and
ZnO 1.15.
______________________________________
Claim 5
Dependent Claim
51 words
A composition according to claim 1 having nd= 1.5299 and Tg=565° C., consisting essentially of the following ingredients: ______________________________________
P.sub.2 O.sub.5
75.60
SiO.sub.2
0.90
B.sub.2 O.sub.3
3.25
Al.sub.2 O.sub.3
10.95
Na.sub.2 O
0.90
K.sub.2 O
1.20
CaO 1.65
MgO 3.00
As.sub.2 O.sub.3
0.25
CeO.sub.2
0.35
F' 0.35 and
CuO 1.60.
______________________________________
Claim 6
Dependent Claim
58 words
A composition according to claim 1 having nd= 1.5412 and Tg=482° C., consisting essentially of the following ingredients: ______________________________________
P.sub.2 O.sub.5
73.80
SiO.sub.2
2.35
B.sub.2 O.sub.3
2.45
Al.sub.2 O.sub.3
8.65
Na.sub.2 O
0.40
K.sub.2 O
1.45
Li.sub.2 O
0.80
CaO 0.65
MgO 2.65
As.sub.2 O.sub.3
0.40
CeO.sub.2
0.25
F' 0.40
CuO 5.30
BaO 0.25 and
ZnO 0.20.
______________________________________
Claim 7
Dependent Claim
58 words
A composition according to claim 1 having nd= 1.5450 and Tg=475° C., consisting essentially of the following ingredients: ______________________________________
P.sub.2 O.sub.5 71.05
SiO.sub.2 1.70
B.sub.2 O.sub.3 2.35
Al.sub.2 O.sub.3 8.60
Na.sub.2 O 0.45
K.sub.2 O 1.30
Li.sub.2 O 1.00
CaO 1.25
MgO 2.30
As.sub.2 O.sub.3 0.35
CeO.sub.2 0.10
F' 0.30
CuO 8.90
BaO 0.25 and
ZnO 0.10.
______________________________________
Claim 8
Dependent Claim
19 words
The composition according to any one of claims 1 thru 6 in the form of an optical filter glass.