US4038090A
Expired / Lapsed
US
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Ion exchangeable glass having low thermal expansion
Assignee: Schott AG
•
Filing: 1975-12-02
•
Granted: 1977-07-26
•
Expires: 1995-12-02
Abstract
Abstract For producing gradient refractive index optical components having substantially no internal stress, there is provided for the ion exchange step glass of the following composition ______________________________________ SiO 2 47 - 61 CaO 0 -5 Al 2 O 3 13 - 20 Li 2 O 3 - 10 La 2 O 3 1 - 8 Na 2 O 6 - 16 Ta 2 O 5 0 - 7.5 K 2 O 0 - 6 ZrO 2 0 - 4 PbO 0.5 - 15 WO 3 0 - 3 TiO 2 0 - 4 BaO 0 - 5 P 2 O 5 0 - 3 ZnO 0 - 5 B 2 O 3 0 - 5 MgO 0 - 5 Fining Agent. ______________________________________
Inventors
- 👤 Georg Gliemeroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:13
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C3/102; C03C3/105; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
201 words
Inorganic vitreous material suitable for ion exchange wherein the refractive index of this material can be changed in the zone of the exchange without any significant change in the linear thermal expansion coefficient, said material consisting essentially of (in percent by weight): ______________________________________
SiO.sub.2 47 - 61 CaO 0 - 5
Al.sub.2 O.sub.3
13 - 20 Li.sub.2 O 3 - 10
La.sub.2 O.sub.3
1 - 8 Na.sub.2 O 6 - 16
Ta.sub.2 O.sub.5
0 - 7.5 K.sub.2 O 0 - 6
ZrO.sub.2 0 - 4 PbO 0.5 - 15
WO.sub.3 0 - 3 TiO.sub.2 0 - 4
BaO 0 - 5 P.sub.2 O.sub.5
0 - 3
ZnO 0 - 5 B.sub.2 O.sub.3
0 - 5
MgO 0 - 5 Fining Agent.
______________________________________ ______________________________________
SiO.sub.2
47 - 61 CaO 0 -5
Al.sub.2 O.sub.3
13 - 20 Li.sub.2 O
3 - 10
La.sub.2 O.sub.3
1 - 8 Na.sub.2 O
6 - 16
Ta.sub.2 O.sub.5
0 - 7.5 K.sub.2 O 0 - 6
ZrO.sub.2
0 - 4 PbO 0.5 - 15
WO.sub.3 0 - 3 TiO.sub.2 0 - 4
BaO 0 - 5 P.sub.2 O.sub.5
0 - 3
ZnO 0 - 5 B.sub.2 O.sub.3
0 - 5
MgO 0 - 5 Fining Agent.
______________________________________
Claim 2
Dependent Claim
201 words
Inorganic vitreous material suitable for ion exchange wherein the refractive index of this material can be changed in the zone of the exchange without any significant change in the linear thermal expansion coefficient, said material consisting essentially of (in percent by weight): ______________________________________
SiO.sub.2 47 - 61 CaO 0 - 5
Al.sub.2 O.sub.3
13 - 20 Li.sub.2 O 3 - 10
La.sub.2 O.sub.3
1 - 8 Na.sub.2 O 6 - 16
Ta.sub.2 O.sub.5
0 - 7.5 K.sub.2 O 0 - 6
ZrO.sub.2 0 - 4 PbO 0.5 - 15
WO.sub.3 0 - 3 TiO.sub.2 0 - 4
BaO 0 - 5 P.sub.2 O.sub.5
0 - 3
ZnO 0 - 5 B.sub.2 O.sub.3
0 - 5
MgO 0 - 5 Fining Agent.
______________________________________ ______________________________________
SiO.sub.2
47 - 61 CaO 0 -5
Al.sub.2 O.sub.3
13 - 20 Li.sub.2 O
3 - 10
La.sub.2 O.sub.3
1 - 8 Na.sub.2 O
6 - 16
Ta.sub.2 O.sub.5
0 - 7.5 K.sub.2 O 0 - 6
ZrO.sub.2
0 - 4 PbO 0.5 - 15
WO.sub.3 0 - 3 TiO.sub.2 0 - 4
BaO 0 - 5 P.sub.2 O.sub.5
0 - 3
ZnO 0 - 5 B.sub.2 O.sub.3
0 - 5
MgO 0 - 5 Fining Agent.
______________________________________
Claim 3
Dependent Claim
92 words
Material according to claim 1, consisting essentially of (in percent by weight): ______________________________________
SiO.sub.2 50 - 58 CaO 0 - 5
Al.sub.2 O.sub.3
14 - 19 Li.sub.2 O 3.5 - 7
La.sub.2 O.sub.3
3 - 6 Na.sub.2 O 10 - 15
Ta.sub.2 O.sub.5
1 - 2 K.sub.2 O 0 - 2
ZrO.sub.2 0.5 - 1.5 PbO 2.5 - 5.5
WO.sub.3 0.5 - 2 TiO.sub.2 0 - 0.5
BaO 0.4 - 1.5 B.sub.2 O.sub.5
0 - 0.5
ZnO 0 - 0.5 B.sub.2 O.sub.3
0 - 0.5
MgO 0 - 1.5 Fining Agent.
______________________________________
Claim 4
Dependent Claim
55 words
Material according to claim 1 wherein the alkali oxide (Li 2 O + Na 2 O + K 2 O ) content is at least 13.5% by weight, the (K 2 O + Na 2 O) content is not below 10% by weight, and the Li 2 O content is not above 6.5% by weight.
Claim 5
Dependent Claim
55 words
Material according to claim 2 wherein the alkali oxide (Li 2 O + Na 2 O + K 2 O ) content is at least 13.5% by weight, the (K 2 O + Na 2 O) content is not below 10% by weight, and the Li 2 O content is not above 6.5% by weight.
Claim 6
Dependent Claim
24 words
Material according to claim 1 wherein the weight ratio of Al 2 O 3 to La 2 O 3 is between 2 and 9.5.
Claim 7
Dependent Claim
24 words
Material according to claim 2 wherein the weight ratio of Al 2 O 3 to La 2 O 3 is between 2 and 9.5.
Claim 8
Dependent Claim
73 words
Material according to claim 1 wherein the minimum content of alkali oxide is 13.5% by weight, the ratio of (K 2 O + Na 2 O) to Li 2 O is between 1.5 and 4.3, the minimum content of Al 2 O 3 + La 2 O 3 is 16% by weight, and the weight ratio of Al 2 O 3 to La 2 O 3 is between 4 and 6 : 1.
Claim 9
Dependent Claim
74 words
Material according to claim 2 wherein the minimum content of alkali oxide is 13.5% by weight, the ratio of (K 2 O + Na 2 O) to Li 2 O is between 1.5 and 4.3, the minimum content of Al 2 O 3 + La 2 O 3 is 16% by weight, and the weight ratio of Al 2 O 3 to La 2 O 3 is between 4 and 6 6 : 1.
Claim 10
Dependent Claim
57 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 1, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δα × 10 7 = 5.
Claim 11
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 2, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 12
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 3, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 13
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 4, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 14
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 5, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 15
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 6, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ Δ × 10 7 = 5.
Claim 16
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 7, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 17
Dependent Claim
58 words
An ion-exchanged material produced by ion exchanging the inorganic vitreous material of claim 8, the refractive index thereof being changed in the exchange zone by at least Δn d × 10 4 = 50, and the linear thermal expansion coefficient between 20° and 300° C. being changed by no more than Δ α × 10 7 = 5.
Claim 18
Dependent Claim
47 words
An ion exchanged material according to claim 9, the refractive index being changed by more than 70 × 10 - 4 , and the linear thermal expansion coefficient being changed in the range between 20° and 300° C. by less than 3 × 10 - 7 /°C.
Claim 19
Dependent Claim
27 words
An ion exchanged material according to claim 9, the ion exchanged process having been conducted with a medium containing Li, Na, K, Rb, Cs, and Tl ions.
Claim 20
Dependent Claim
16 words
An ion exchanged material according to claim 18, a salt solution being employed as the medium.
Claim 21
Dependent Claim
16 words
An ion exchanged material according to claim 18, a salt bath being employed as the medium.
Claim 22
Dependent Claim
15 words
An ion exchanged material according to claim 18, a suspension being employed as the medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |