US4390638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidproof, hydrolysis-resistant optical and ophthalmic glass of low density
Assignee: Schott AG
•
Filing: 1981-07-13
•
Granted: 1983-06-28
•
Expires: 2001-07-13
Abstract
Abstract An optical and ophthalmic glass having an index of refraction of >/=1.69, an Abbe number of >/=37, and a density of </=3.30 g/cm3, consists essentially of (in % by weight): -SiO2 18-36 -B2O3 3-18 -GeO2 0-8 -Al2O3 0-6, -wherein SiO2 + B2O3 + Al2O3 + GeO2 = 25-39 -P2O5 0-14, -wherein SiO2 + B2O3 + Al2O3 + GeO2 + P2O5 = 30-44 -Li2O 0-12 -Na2O 0-14 -K2O 0-18 -Li2O + Na2O + K2O = 2-18 -MgO 0-15 -CaO 7-25 -MgO + CaO 15-32 -SrO 0-13 -BaO 0-17 -ZnO 0-15 -PbO 0-10 -SrO + BaO + ZnO + PbO 0-20 -TiO2 3-14 -Nb2O5 0-13 -WO3 0-10 -TiO2 + Nb2O5 + WO3 = 10-21 -ZrO2 0-15, -La2O3 0-20 -Y2O3 0-16 -Gd2O3 0-16 -Yb2O3 0-10 -La2O3 + Y2O3 + Gd2O3 + Yb2O3 = 0-20 -Ta2O5 0-13 -HfO2 0-5 -SnO2 0-6. -
Inventors
- 👤 Karl Mennemann
- 👤 Georg Gliemeroth
- 👤 Volkmar Geiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:01
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
164 words
An optical ophthalmic glass having an index of refraction of ≧1.69, an Abbe number of ≧37, and a density of ≦3.30 g/cm 3 , consisting essentially of (in % by weight): ______________________________________
SiO.sub.2 18-36
B.sub.2 O.sub.3 3-18
GeO.sub.2 0-8
Al.sub.2 O.sub.3 0-6,
wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2
25-39
P.sub.2 O.sub.5 0-14,
wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2 +
P.sub.2 O.sub.5 = 30-44
Li.sub.2 O 0-12
Na.sub.2 O 0-14
K.sub.2 O 0-18
Li.sub.2 O + Na.sub.2 O + K.sub.2 O =
2-18
MgO 0-15
CaO 7-21.35
MgO + CaO 15-32
SrO 0-13
BaO 0-17
ZnO 0-15
PbO 0-10
SrO + BaO + ZnO + PbO 0-20
TiO.sub.2 3.95-14
Nb.sub.2 O.sub.5 0-13
WO.sub.3 0-10
TiO.sub.2 + Nb.sub.2 O.sub.5 + WO.sub.3 =
10-21
ZrO.sub.2 2.9-15,
La.sub.2 O.sub.3 0-20
Y.sub.2 O.sub.3 0-16
Gd.sub.2 O.sub.3 0-16
Yb.sub.2 O.sub.3 0-10
La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + Yb.sub.2 O.sub.3
= 0-20
Ta.sub.2 O.sub.5 0-13
HfO.sub.2 0-6
SnO.sub.2 0-6.
______________________________________
Claim 2
Dependent Claim
164 words
An optical ophthalmic glass having an index of refraction of ≧1.69, an Abbe number of ≧37, and a density of ≦3.30 g/cm 3 , consisting essentially of (in % by weight): ______________________________________
SiO.sub.2 18-36
B.sub.2 O.sub.3 3-18
GeO.sub.2 0-8
Al.sub.2 O.sub.3 0-6,
wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2
25-39
P.sub.2 O.sub.5 0-14,
wherein SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + GeO.sub.2 +
P.sub.2 O.sub.5 = 30-44
Li.sub.2 O 0-12
Na.sub.2 O 0-14
K.sub.2 O 0-18
Li.sub.2 O + Na.sub.2 O + K.sub.2 O =
2-18
MgO 0-15
CaO 7-21.35
MgO + CaO 15-32
SrO 0-13
BaO 0-17
ZnO 0-15
PbO 0-10
SrO + BaO + ZnO + PbO 0-20
TiO.sub.2 3.95-14
Nb.sub.2 O.sub.5 0-13
WO.sub.3 0-10
TiO.sub.2 + Nb.sub.2 O.sub.5 + WO.sub.3 =
10-21
ZrO.sub.2 2.9-15,
La.sub.2 O.sub.3 0-20
Y.sub.2 O.sub.3 0-16
Gd.sub.2 O.sub.3 0-16
Yb.sub.2 O.sub.3 0-10
La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + Yb.sub.2 O.sub.3
= 0-20
Ta.sub.2 O.sub.5 0-13
HfO.sub.2 0-6
SnO.sub.2 0-6.
______________________________________
Claim 3
Dependent Claim
185 words
An optical and ophthalmic glass of claim 1 having an Abbe number of ≧ 39 and a density of ≦3.2 g/cm 3 , which is sufficiently stable with respect to crystallization to permit continuous manufacture, and which is acid resistant and resistant to climatic changes, consisting essentially of (% by weight): ______________________________________
B.sub.2 O.sub.3
5-14
SiO.sub.2 24-32
Al.sub.2 O.sub.3
0-6
GeO.sub.2 0-8
B.sub.2 O.sub.3 + SiO.sub.2 + Al.sub.2 O.sub.3 + GeO.sub.2 =
33-39
P.sub.2 O.sub.5
0-6
B.sub.2 O.sub.3 + SiO.sub.2 + Al.sub.2 O.sub.3 + GeO.sub.2 +
P.sub.2 O.sub.5 = 37-43
Li.sub.2 O 0-7
Na.sub.2 O 0-8
K.sub.2 O 0-11
Li.sub.2 O + Na.sub.2 O + K.sub.2 O = 4-14
MgO 0-10
CaO 12-21.35
MgO + CaO = 18-27
ZnO 0-8
BaO 0-6
SrO 0-5
PbO 0-5
ZnO + BaO + SrO + PbO = 0-8
TiO.sub.2 6-10
Nb.sub.2 O.sub.5
0-8
WO.sub.3 0-10
TiO.sub.2 + Nb.sub.2 O.sub.5 + WO.sub.3 = 13-19
ZrO.sub.2 3-9
La.sub.2 O.sub.3
0-11
Y.sub.2 O.sub.3
0-12
Gd.sub.2 O.sub.3
0-8
Yb.sub.2 O.sub.3
0-7
La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 + Yb.sub.2
O.sub.3 = 0-14
Ta.sub.2 O 0-7
HfO.sub.2 0-6
SnO.sub.2 0-6
______________________________________
Claim 4
Dependent Claim
13 words
A glass of claim 1 wherein the amount of TiO 2 is 6-10%.
Claim 5
Dependent Claim
16 words
A glass of claim 1 wherein 0-1% of the oxygen ions are replaced by fluoride ions.
Claim 6
Dependent Claim
10 words
A lens made of glass of claim 1 or 2.
Claim 7
Dependent Claim
7 words
A lens of claim 5 for eyeglasses.
Claim 8
Dependent Claim
13 words
A glass of claim 1 wherein the amount of TiO 2 is 6-14%.
Claim 9
Dependent Claim
13 words
A glass of claim 1 wherein the amount of TiO 2 is 3.95-10%.
Claim 10
Dependent Claim
13 words
A glass of claim 1 wherein the amount of ZrO 2 is 3-8%.
Claim 11
Dependent Claim
13 words
A glass of claim 3 wherein the amount of ZrO 2 is 3-8%.
Claim 12
Dependent Claim
13 words
A glass of claim 7 wherein the amount of ZrO 2 is 3-8%.
Claim 13
Dependent Claim
13 words
A glass of claim 1 wherein the amount of ZrO 2 is 3-15%.
Claim 14
Dependent Claim
13 words
A glass of claim 3 wherein the amount of ZrO 2 is 3-15%.
Claim 15
Dependent Claim
13 words
A glass of claim 7 wherein the amount of ZrO 2 is 3-15%.
References Cited (Backward Citations)
US3877953A
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US3898093A
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US4055435A
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US4084978A
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US4057435A
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GB1591210A
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DE2809409C3
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US4194916A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |