US5021366A
Expired / Lapsed
US
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Fluorine-free phosphate glasses
Assignee: Corning Inc
•
Filing: 1990-10-19
•
Granted: 1991-06-04
•
Expires: 2010-10-19
Abstract
Abstract This invention is drawn particularly to the production of glasses having essentially fluorine-free compositions consisting essentially, in mole percent, of: ______________________________________ Li 2 O 5-10 P 2 O 5 30-36 Na 2 O 5-15 Al 2 O 3 0-5 K 2 O 0-6 CeO 2 0-2 Li 2 O + Na 2 O + K 2 O 15-25 SnO 0-20 ZnO 10-33 PbO 0-20 CaO 0-20 Sb 2 O 3 0-12 SrO 0-20 Bi 2 O 3 0-6 BaO 0-20 SnO + PbO + 0-20. Sb 2 O 3 + Bi 2 O 3 CaO + SrO + BaO 12-25 ______________________________________
Inventors
- 👤 Bruce G. Aitken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A glass having a composition which is essentially fluorine-free exhibiting an annealing point between 300°-340° C., a linear coefficient of thermal expansion (25°-300° C.) between 145-170×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.25% consisting essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
Li.sub.2 O 5-10 P.sub.2 O.sub.5
30-36
Na.sub.2 O 5-15 Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
15-25 SnO 0-20
ZnO 10-33 PbO 0-20
CaO 0-20 Sb.sub.2 O.sub.3
0-12
SrO 0-20 Bi.sub.2 O.sub.3
0-6
BaO 0-20 SnO + PbO + 0-20.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-25
______________________________________
Claim 2
Dependent Claim
119 words
A glass having a composition which is essentially fluorine-free exhibiting an annealing point between 300°-340° C., a linear coefficient of thermal expansion (25°-300° C.) between 145-170×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.25% consisting essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
Li.sub.2 O 5-10 P.sub.2 O.sub.5
30-36
Na.sub.2 O 5-15 Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
15-25 SnO 0-20
ZnO 10-33 PbO 0-20
CaO 0-20 Sb.sub.2 O.sub.3
0-12
SrO 0-20 Bi.sub.2 O.sub.3
0-6
BaO 0-20 SnO + PbO + 0-20.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-25
______________________________________
Claim 3
Dependent Claim
13 words
A glass according to claim 1 exhibiting a refractive index of about 1.605.
Claim 4
Dependent Claim
71 words
A glass according to claim 1 consisting essentially of: ______________________________________
Li.sub.2 O 6-10 P.sub.2 O.sub.5
32-36
Na.sub.2 O 6-10 Al.sub.2 O.sub.3
0-3
K.sub.2 O 4-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
18-22 SnO 0.5-2
ZnO 15-33 PbO 0-10
CaO 6-15 Sb.sub.2 O.sub.3
3-12
SrO 0-10 Bi.sub.2 O.sub.3
0-3
BaO 0-10 SnO + PbO + 3.5-14.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-20
______________________________________
Claim 5
Dependent Claim
13 words
A glass according to claim 3 exhibiting a refractive index of about 1.605.
Claim 6
Dependent Claim
123 words
A lens prepared from a glass having a composition which is essentially fluorine-free exhibiting an annealing point between 300°-340° C., a linear coefficient of thermal expansion (25°-300° C.) between 145-170×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.25% consisting essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
Li.sub.2 O 5-10 P.sub.2 O.sub.5
30-36
Na.sub.2 O 5-15 Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
15-25 SnO 0-20
ZnO 10-33 PbO 0-20
CaO 0-20 Sb.sub.2 O.sub.3
0-12
SrO 0-20 Bi.sub.2 O.sub.3
0-6
BaO 0-20 SnO + PbO + 0-20.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-25
______________________________________
Claim 7
Dependent Claim
123 words
A lens prepared from a glass having a composition which is essentially fluorine-free exhibiting an annealing point between 300°-340° C., a linear coefficient of thermal expansion (25°-300° C.) between 145-170×10 -7 /°C., and a weight loss after exposure to boiling water for six hours no greater than 0.25% consisting essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
Li.sub.2 O 5-10 P.sub.2 O.sub.5
30-36
Na.sub.2 O 5-15 Al.sub.2 O.sub.3
0-5
K.sub.2 O 0-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
15-25 SnO 0-20
ZnO 10-33 PbO 0-20
CaO 0-20 Sb.sub.2 O.sub.3
0-12
SrO 0-20 Bi.sub.2 O.sub.3
0-6
BaO 0-20 SnO + PbO + 0-20.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-25
______________________________________
Claim 8
Dependent Claim
16 words
A lens according to claim 5 wherein said glass exhibits a refractive index of about 1.605.
Claim 9
Dependent Claim
78 words
A lens according to claim 5 prepared from a glass having a composition consisting essentially of: ______________________________________
Li.sub.2 O 6-10 P.sub.2 O.sub.5
32-36
Na.sub.2 O 6-10 Al.sub.2 O.sub.3
0-3
K.sub.2 O 4-6 CeO.sub.2 0-2
Li.sub.2 O + Na.sub.2 O + K.sub.2 O
18-22 SnO 0.5-2
ZnO 15-33 PbO 0-10
CaO 6-15 Sb.sub.2 O.sub.3
3-12
SrO 0-10 Bi.sub.2 O.sub.3
0-3
BaO 0-10 SnO + PbO + 3.5-14.
Sb.sub.2 O.sub.3 + Bi.sub.2 O.sub.3
CaO + SrO + BaO
12-20
______________________________________
Claim 10
Dependent Claim
16 words
A lens according to claim 7 wherein said glass exhibits a refractive index of about 1.605.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |