US3877995A
Expired / Lapsed
US
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Potassium borate glass compositions
Assignee: Dow Chemical Co
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Filing: 1973-12-03
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Granted: 1975-04-15
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Expires: 1993-12-03
Abstract
Abstract An amorphous glass sytem based on potassium borate, which may also contain additives to modify viscosity, expansion coefficient, and the like, has found particular utility as the membrane material in alkali metal-sulfur batteries due to its inertness towards potassium, sulfur and potassium sulfide, as well as its excellent ability to conduct potassium ions.
Inventors
- 👤 Charles A Levine
- 👤 Floris Y Tsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:49
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; C03C13/00; C03C3/04; C03C3/062; C03C3/064; C03C3/14; C03C4/00; C03C4/18; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; H01M50/00; H01M50/40; H01M50/409; H01M50/431; H01M50/434; H01M50/437; H01M50/44; H01M50/489; H01M2300/00; H01M2300/0017; H01M2300/0048; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
AN AMORPHOUS POTASSIUM BORATE FLASS SYSTEM OF THE FORMAL K2O. (2+A) B2O3. (B-C-E) KX.C 2M(X'')2. DY. E 3 M'' (X")3 WHEREIN, IN THE FORMULA, -0.5<A<2; 0< B $ (1+A 2) + 0.3, WHEN X IS F; 0< B $ (1+A/6) + 0.1, WHEN X IS CL OR BR; 0 $ C $ B; 0 $ D $1; 0 $ E $ (B-C); M IS MG, CA, SR OR BA; M'' IS AL OR GA; Y IS SIO2 OR 1 2 R2O5; AND X,X'' AND X ARE, INDEPENDENTLY, CL BR OR F.
Claim 2
Dependent Claim
91 words
AN AMORPHOUS POTASSIUM BORATE FLASS SYSTEM OF THE FORMAL K2O. (2+A) B2O3. (B-C-E) KX.C 2M(X'')2. DY. E 3 M'' (X")3 WHEREIN, IN THE FORMULA, -0.5<A<2; 0< B $ (1+A 2) + 0.3, WHEN X IS F; 0< B $ (1+A/6) + 0.1, WHEN X IS CL OR BR; 0 $ C $ B; 0 $ D $1; 0 $ E $ (B-C); M IS MG, CA, SR OR BA; M'' IS AL OR GA; Y IS SIO2 OR 1 2 R2O5; AND X,X'' AND X ARE, INDEPENDENTLY, CL BR OR F.
Claim 3
Dependent Claim
50 words
The composition of claim 1 wherein, in the formula, O < or = a < or = 0.2, 0.01 < or = b < or = 0.5, O < or = c < or = 0.2, d and e are O, M is Mg and X and X'' are F.
Claim 4
Dependent Claim
149 words
In a battery cell comprising a first oxidizable liquid metal electrode,a second fluid reducible electrode and a substantially fluid tight membrane separating said first and second electrodes, the improvement which comprises a separating membrane fabricated from an amorphous potassium borate glass composition of the formula K2O. (2+a) B2O3. (b-c-e) KX. c/2 M(X'')2. dY. e/3 M''(X'''')3wherein, in the formula, -0.5< a< 2; O < or = b < or = (1+a/2) + 0.3, when X is F; O < or = b < or = (1+a/6) + 0.1, when X is Cl or Br; O < or = c < or = b; O < or = b < or = 1; O < or = e < or = (b-c); M is Mg, Ca, Sr or Ba; M'' is Al or Ga; Y is SiO2 or 1/2 P2O5; and X, X'' and X'''' are, independently, Cl, Br or F.
Claim 5
Dependent Claim
149 words
In a battery cell comprising a first oxidizable liquid metal electrode,a second fluid reducible electrode and a substantially fluid tight membrane separating said first and second electrodes, the improvement which comprises a separating membrane fabricated from an amorphous potassium borate glass composition of the formula K2O. (2+a) B2O3. (b-c-e) KX. c/2 M(X'')2. dY. e/3 M''(X'''')3wherein, in the formula, -0.5< a< 2; O < or = b < or = (1+a/2) + 0.3, when X is F; O < or = b < or = (1+a/6) + 0.1, when X is Cl or Br; O < or = c < or = b; O < or = b < or = 1; O < or = e < or = (b-c); M is Mg, Ca, Sr or Ba; M'' is Al or Ga; Y is SiO2 or 1/2 P2O5; and X, X'' and X'''' are, independently, Cl, Br or F.
Claim 6
Dependent Claim
50 words
The article of claim 3 wherein, in the formula, O < or = a < or = 0.2, 0.01 < or = b < or = 0.5, O < or = c < or = 0.2, d and e are O, M is Mg and X and X'' are F.
Claim 7
Dependent Claim
53 words
The article of claim 3 wherein the separating membrane is in the form of one or more fine hollow fibers having an outside diameter/wall thickness ratio of from about 3 to 20, ranging in outside diameter from about 20 to 1000 microns and a wall thickness of from about 5 to 100 microns.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |