US4537864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal fluoride glasses in the CdF2 -PbF2 -AlF3 -(LiF) system
Assignee: Corning Glass Works
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Filing: 1983-08-31
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Granted: 1985-08-27
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Expires: 2003-08-31
Abstract
Abstract Novel halide glass-forming compositions in the CdF 2 -AlF 3 -PbF 2 and CdF 2 -AlF 3 -PbF 2 -LiF composition fields are disclosed which exhibit unusual glass stability. The constituents of these glasses are potentially vapor transportable, so that very pure glass articles exhibiting excellent infrared transparency can be envisioned.
Inventors
- 👤 Paul A. Tick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:54
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/32; C03C3/325; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S65/00; Y10S65/15; Y10S65/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
A non-oxide, metal-fluoride-containing glass-forming composition comprising, in mole percent, about 20-46% CdF 2 , 22-52% AlF 3 , 18-44% PbF 2 , and at least 80% total of CdF 2 +AlF 3 +PbF 2 , the mole ratio of CdF 2 :PbF 2 in the composition being greater than 1:2.
Claim 2
Dependent Claim
50 words
A non-oxide, metal-fluoride-containing glass-forming composition comprising, in mole percent, about 20-46% CdF 2 , 22-52% AlF 3 , 18-44% PbF 2 , and at least 80% total of CdF 2 +AlF 3 +PbF 2 , the mole ratio of CdF 2 :PbF 2 in the composition being greater than 1:2.
Claim 3
Dependent Claim
103 words
A glass-forming composition in accordance with claim 1 which consists essentially, in mole percent, of about 20-46% CdF 2 , 22-52% AlF 3 , 18-44% PbF 2 , at least 80% total of CdF 2 +AlF 3 +PbF 2 , and 5-15% LiF, and, optionally, up to 10% total of fluorides selected from the group consisting of YbF 3 , CaF 2 , SrF 2 , BaF 2 , NaF and KF, and up to 5% of ZnF 2 , the mole ratio of (CdF 2 +ZnF 2 +CaF 2 +SrF 2 +BaF 2 ):PbF 2 in the composition being greater than 1:2.
Claim 4
Dependent Claim
28 words
A composition in accordance with claim 2 which contains, in mole percent, about 21-38% CdF 2 , 23-42% AlF 3 , 18-37% PbF 2 , and 5-15% LiF.
Claim 5
Dependent Claim
21 words
A composition in accordance with claim 3 which consists essentially of CdF 2 , AlF 3 , PbF 2 and LiF.
Claim 6
Dependent Claim
124 words
A non-oxide, metal-fluoride glass article produced from a glass having a crystallization temperature T xtal at least 75° C. higher than its transition temperature T g and a composition which consists essentially, in mole percent, of about 20-46% CdF 2 , 22-52% AlF 3 , 18-44% PbF 2 , at least 80% total of CdF 2 +AlF 3 +PbF 2 , and 5-15% LiF, and, optionally, up to 10% total of fluorides selected from the group consisting of YbF 3 , CaF 2 , SrF 2 , BaF 2 , NaF and KF, and up to 5% of ZnF 2 , the mole ratio of (CdF 2 +ZnF 2 +CaF 2 +SrF 2 +BaF 2 ):PbF 2 in the composition being greater than 1:2.
Claim 7
Dependent Claim
124 words
A non-oxide, metal-fluoride glass article produced from a glass having a crystallization temperature T xtal at least 75° C. higher than its transition temperature T g and a composition which consists essentially, in mole percent, of about 20-46% CdF 2 , 22-52% AlF 3 , 18-44% PbF 2 , at least 80% total of CdF 2 +AlF 3 +PbF 2 , and 5-15% LiF, and, optionally, up to 10% total of fluorides selected from the group consisting of YbF 3 , CaF 2 , SrF 2 , BaF 2 , NaF and KF, and up to 5% of ZnF 2 , the mole ratio of (CdF 2 +ZnF 2 +CaF 2 +SrF 2 +BaF 2 ):PbF 2 in the composition being greater than 1:2.
Claim 8
Dependent Claim
32 words
A glass article in accordance with claim 5 having a composition which contains, in mole percent, about 21-38% CdF 2 , 24-42% AlF 3 , 20-37% PbF 2 , and 5-15% LiF.
Claim 9
Dependent Claim
22 words
A glass article in accordance with claim 6 which consists essentially of CdF 2 , AlF 3 , PbF 2 and LiF.
References Cited (Backward Citations)
US2466509A
Cited
GB1410203A
Cited
US4141741A
Cited
US4244722A
Cited
FR2445820A1
Cited
US4328318A
Cited
US4308066A
Cited
EP0036373A1
Cited
JPS5751146A
Cited
JPS57166328A
Cited
JPS57191240A
Cited
US4378987A
Cited
FR2521546A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |