US5256604A
Expired / Lapsed
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Low melting, durable phosphate glasses
Assignee: Corning Inc
•
Filing: 1992-04-24
•
Granted: 1993-10-26
•
Expires: 2012-04-24
Abstract
Abstract This invention is directed to the production of glasses exhibiting an annealing point between 290°-325° C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25°-300° C.) between 130-160×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of ______________________________________ Li 2 O 0-10 CaO + SrO + 0-20 BaO(RO) Na 2 O 0-10 ZnO 26-50 Li 2 O + Na 2 O 1-20 RO + ZnO 26-50 K 2 O 0-8 SnO 0-5 Li 2 O + Na 2 O + 5-25 Sb 2 O 3 0-8 K 2 O(R 2 O) Ag 2 O 0-13 Al 2 O 3 0.25-5 Tl 2 O 0-12 P 2 O 5 30-36 Ag 2 O + Tl 2 O 1-14 B 2 O 3 0-5 R 2 O + Ag 2 O + Tl 2 O 15-30 CuO 0-5 CaO 0-20 Bi 2 O 3 0-3 BaO 0-10 CeO 2 0-2 SrO 0-10 PbO 0-10 ______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Inventors
- 👤 Bruce G. Aitken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:47
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17; C03C3/19
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A glass exhibiting an annealing point between 290°-325° C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25°-300° C.) between 130-160×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of ______________________________________
Li.sub.2 O 0-10 CaO + SrO + 0-20
BaO(RO)
Na.sub.2 O 0-10 ZnO 26-50
Li.sub.2 O + Na.sub.2 O
1-20 RO + ZnO 26-50
K.sub.2 O 0-8 SnO 0-5
Li.sub.2 O + Na.sub.2 O +
5-25 Sb.sub.2 O.sub.3
0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3
0.25-5
Tl.sub.2 O 0-12 P.sub.2 O.sub.5
30-36
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3
0-5
R.sub.2 O + Ag.sub.2 O + Tl.sub.2 O
15-30 CuO 0-5
CaO 0-20 Bi.sub.2 O.sub.3
0-3
BaO 0-10 CeO.sub.2 0-2
SrO 0-10 PbO 0-10
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Claim 2
Dependent Claim
167 words
A glass exhibiting an annealing point between 290°-325° C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25°-300° C.) between 130-160×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of ______________________________________
Li.sub.2 O 0-10 CaO + SrO + 0-20
BaO(RO)
Na.sub.2 O 0-10 ZnO 26-50
Li.sub.2 O + Na.sub.2 O
1-20 RO + ZnO 26-50
K.sub.2 O 0-8 SnO 0-5
Li.sub.2 O + Na.sub.2 O +
5-25 Sb.sub.2 O.sub.3
0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3
0.25-5
Tl.sub.2 O 0-12 P.sub.2 O.sub.5
30-36
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3
0-5
R.sub.2 O + Ag.sub.2 O + Tl.sub.2 O
15-30 CuO 0-5
CaO 0-20 Bi.sub.2 O.sub.3
0-3
BaO 0-10 CeO.sub.2 0-2
SrO 0-10 PbO 0-10
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Claim 3
Dependent Claim
120 words
A glass according to claim 1 consisting essentially of ______________________________________
Li.sub.2 O 2-8 CaO + SrO + BaO(RO)
0-15
Na.sub.2 O 2-12 ZnO 26-46
Li.sub.2 O + Na.sub.2 O
5-20 RO + ZnO 26-48
K.sub.2 O 0-6 SnO 0-3
Li.sub.2 O + Na.sub.2 O +
5-20 Sb.sub.2 O.sub.3 0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3 0.5-3
Tl.sub.2 O 0-12 P.sub.2 O.sub.5 30-34
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3 0-3
R.sub.2 O + Ag.sub.2 O +
15-25 CuO 0-5
Tl.sub.2 O
CaO 0-15 Bi.sub.2 O.sub.3 0-3
BaO 0-8 CeO.sub.2 0-2
SrO 0-8 PbO 0-5
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Claim 4
Dependent Claim
171 words
A lens prepared from a glass exhibiting an annealing point between 290°-325° C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25°-300° C.) between 130-160×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of ______________________________________
Li.sub.2 O 0-10 CaO + SrO + BaO(RO0
0-20
Na.sub.2 O 0-10 ZnO 26-50
Li.sub.2 O + Na.sub.2 O
1-25 RO + ZnO 26-50
K.sub.2 O 0-8 SnO 0-5
Li.sub.2 O + Na.sub.2 O +
5-25 Sb.sub.2 O.sub.3 0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3 0.25-5
Tl.sub.2 O 0-12 P.sub.2 O.sub.5 30-36
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3 0-5
R.sub.2 O + Ag.sub.2 O +
15-30 CuO 0-5
Tl.sub.2 O
CaO 0-20 Bi.sub.2 O.sub.3 0-3
BaO 0-10 CeO.sub.2 0-2
SrO 0-10 PbO 0-10
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Claim 5
Dependent Claim
171 words
A lens prepared from a glass exhibiting an annealing point between 290°-325° C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25°-300° C.) between 130-160×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of ______________________________________
Li.sub.2 O 0-10 CaO + SrO + BaO(RO0
0-20
Na.sub.2 O 0-10 ZnO 26-50
Li.sub.2 O + Na.sub.2 O
1-25 RO + ZnO 26-50
K.sub.2 O 0-8 SnO 0-5
Li.sub.2 O + Na.sub.2 O +
5-25 Sb.sub.2 O.sub.3 0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3 0.25-5
Tl.sub.2 O 0-12 P.sub.2 O.sub.5 30-36
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3 0-5
R.sub.2 O + Ag.sub.2 O +
15-30 CuO 0-5
Tl.sub.2 O
CaO 0-20 Bi.sub.2 O.sub.3 0-3
BaO 0-10 CeO.sub.2 0-2
SrO 0-10 PbO 0-10
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
Claim 6
Dependent Claim
127 words
A lens according to claim 3 prepared from a glass having a composition consisting essentially of ______________________________________
Li.sub.2 O 2-8 CaO + SrO + BaO(RO)
0-15
Na.sub.2 O 2-12 ZnO 26-46
Li.sub.2 O + Na.sub.2 O
5-20 RO + ZnO 26-48
K.sub.2 O 0-6 SnO 0-3
Li.sub.2 O + Na.sub.2 O +
5-20 Sb.sub.2 O.sub.3 0-8
K.sub.2 O(R.sub.2 O)
Ag.sub.2 O 0-13 Al.sub.2 O.sub.3 0.5-3
Tl.sub.2 O 0-12 P.sub.2 O.sub.5 30-34
Ag.sub.2 O + Tl.sub.2 O
1-14 B.sub.2 O.sub.3 0-3
R.sub.2 O + Ag.sub.2 O +
15-25 CuO 0-5
Tl.sub.2 O
CaO 0-15 Bi.sub.2 O.sub.3 0-3
BaO 0-8 CeO.sub.2 0-2
SrO 0-8 PbO 0-5
______________________________________ with the proviso that, in the presence of SnO and/or Bi 2 O 3 , Ag 2 O will be essentially absent.
References Cited (Backward Citations)
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US4940677A
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US5021366A
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |