Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
117 words
A contrast enhancement glass composition consisting essentially of, in wt %, ______________________________________
SiO.sub.2 40-60
B.sub.2 O.sub.3 0-6
Al.sub.2 O.sub.3 0-2
ΣLi.sub.2 O, Na.sub.2 O, K.sub.2 O = R.sub.2 O
24-30
ΣMgO, CaO, SrO, ZnO, BaO = RO
0-10
TiO.sub.2 1-3.5
CeO.sub.2 1-3.5
Nd.sub.2 O.sub.3 4-12
La.sub.2 O.sub.3 1-11
MnO.sub.2 0.1-1.0
Er.sub.2 O.sub.3 (when included)
0.2-1.0
CuO 0.1-0.5
CoO 0.0005-0.0040
V.sub.2 O.sub.5 0.05-0.50
Cr.sub.2 O.sub.3 (when included)
0.0005-0.0300
Photopic (% T) 12-24
% T @ 445 nm 20-30
% T @ 555 nm 26-36
% T @ 580 nm 0-3
% T @ 618 nm 23-35
% T @ 620 nm 23-34
______________________________________ having color properties corresponding to values of (x,y) of the larger quadrangle of FIG. 1.
Claim 2
Dependent Claim
117 words
A contrast enhancement glass composition consisting essentially of, in wt %, ______________________________________
SiO.sub.2 40-60
B.sub.2 O.sub.3 0-6
Al.sub.2 O.sub.3 0-2
ΣLi.sub.2 O, Na.sub.2 O, K.sub.2 O = R.sub.2 O
24-30
ΣMgO, CaO, SrO, ZnO, BaO = RO
0-10
TiO.sub.2 1-3.5
CeO.sub.2 1-3.5
Nd.sub.2 O.sub.3 4-12
La.sub.2 O.sub.3 1-11
MnO.sub.2 0.1-1.0
Er.sub.2 O.sub.3 (when included)
0.2-1.0
CuO 0.1-0.5
CoO 0.0005-0.0040
V.sub.2 O.sub.5 0.05-0.50
Cr.sub.2 O.sub.3 (when included)
0.0005-0.0300
Photopic (% T) 12-24
% T @ 445 nm 20-30
% T @ 555 nm 26-36
% T @ 580 nm 0-3
% T @ 618 nm 23-35
% T @ 620 nm 23-34
______________________________________ having color properties corresponding to values of (x,y) of the larger quadrangle of FIG. 1.
Claim 3
Dependent Claim
111 words
A glass of claim 1 consisting essentially of, in wt %, ______________________________________
SiO.sub.2 40-48
B.sub.2 O.sub.3 3-6
Al.sub.2 O.sub.3 0-1
ΣLi.sub.2 O, Na.sub.2 O, K.sub.2 O = R.sub.2 O
25-28
ΣMgO, CaO, SrO, ZnO, BaO = RO
3-5
TiO.sub.2 2-3
CeO.sub.2 2-3
Nd.sub.2 O.sub.3 6-8.5
La.sub.2 O.sub.3 4-8
MnO.sub.2 0.2-0.8
Er.sub.2 O.sub.3 (when included)
0.3-1.0
CuO 0.15-0.40
CoO 0.0010-0.0035
V.sub.2 O.sub.5 0.10-0.40
Cr.sub.2 O.sub.3 (when included)
0.005-0.0150
Photopic (%T) 15-21
%T @ 445 nm 22.6-28.6
%T @ 555 nm 30.5-33.5
%T @ 580 nm 0-2
%T @ 618 nm 26.3-32.7
%T @ 620 nm 25.5-31.5
______________________________________ having color properties corresponding to values of (x,y) of the smaller quadrangle of FIG. 1.
Claim 4
Dependent Claim
39 words
A glass of claim 1 having the following properties: ______________________________________
Photopic (%T) 15-21
%T @ 445 nm 22.6-28.6
%T @ 555 nm 30.5-33.5
%T @ 580 nm 0-2
%T @ 618 nm 26.3-32.7
%T @ 620 nm 25.5-31.5.
______________________________________
Claim 5
Dependent Claim
17 words
A glass of claim 1 wherein R 2 O is Na 2 O and K 2 O.
Claim 6
Dependent Claim
9 words
A glass of claim 1 wherein RO is BaO.
Claim 7
Dependent Claim
17 words
A glass of claim 2 wherein R 2 O is Na 2 O and K 2 O.
Claim 8
Dependent Claim
9 words
A glass of claim 2 wherein RO is BaO.
Claim 9
Dependent Claim
9 words
A glass of claim 4 wherein RO is BaO.
Claim 10
Dependent Claim
9 words
A glass of claim 6 wherein RO is BaO.
Claim 11
Dependent Claim
17 words
A glass of claim 1 also containing up to 0.0150 wt % Cr 2 O 3 .
Claim 12
Dependent Claim
24 words
In a color CRT device comprising a color CRT and a filter glass, the improvement wherein the filter glass is one of claim 1.
Claim 13
Dependent Claim
24 words
In a color CRT device comprising a color CRT and a filter glass, the improvement wherein the filter glass is one of claim 2.
Claim 14
Dependent Claim
24 words
In a color CRT device comprising a color CRT and a filter glass, the improvement wherein the filter glass is one of claim 8.
Claim 15
Dependent Claim
24 words
In a color CRT device comprising a color CRT and a filter glass, the improvement wherein the filter glass is one of claim 9.
Claim 16
Dependent Claim
24 words
In a color CRT device comprising a color CRT and a filter glass, the improvement wherein the filter glass is one of claim 10.
Claim 17
Dependent Claim
21 words
A glass composition of claim 1 containing an amount of Er 2 O 3 in the range of 0.2-1.0 wt. %.
Claim 18
Dependent Claim
21 words
A glass composition of claim 1 containing an amount of Cr 2 O 3 in the range of 0.0005-0.0300 wt. %.
Claim 19
Dependent Claim
21 words
A glass composition of claim 16 containing an amount of Cr 2 O 3 in the range of 0.0005-0.0300 wt. %.