US4297193A
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pH Electrode glass compositions
Assignee: Bayer Corp
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Filing: 1980-05-22
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Granted: 1981-10-27
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Expires: 2000-05-22
Abstract
Abstract A glass composition for use in pH-responsive glass electrodes, and a glass electrode having a pH-responsive membrane of such glass, which composition consists essentially of (in mole percent on the oxide basis): a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 12 mole percent of at least one oxide selected from the group consisting of La 2 O 3 and Pr 2 O 3 ; d. from about 2 to about 10 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; e. from 0 to about 4 mole percent UO 2 ; and f. the balance SiO 2 ; with the proviso that there is present in the composition at least about 2 mole percent of at least one oxide selected from the group consisting of Pr 2 O 3 and Nb 2 O 5 .
Inventors
- 👤 Donald P. Brezinski
- 👤 Leroy R. Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:49
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/18; C03C3/00; C03C3/04; C03C3/076; C03C3/095; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
172 words
A glass composition for use in pH-responsive glass electrodes consisting essentially of (in mole percent on the oxide basis): a. from about 30 to about 37 mole percent Li 2 0; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 12 mole percent of at least one oxide selected from the group consisting of La 2 O 3 and Pr 2 O 3 ; d. from about 2 to about 10 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; e. from 0 to about 4 mole percent UO 2 ; and f. the balance SiO 2 ; with the proviso that there is present in the composition at least about 2 mole percent of at least one oxide selected from the group consisting of Pr 2 O 3 and Nb 2 O 5 .
Claim 2
Dependent Claim
172 words
A glass composition for use in pH-responsive glass electrodes consisting essentially of (in mole percent on the oxide basis): a. from about 30 to about 37 mole percent Li 2 0; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 12 mole percent of at least one oxide selected from the group consisting of La 2 O 3 and Pr 2 O 3 ; d. from about 2 to about 10 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; e. from 0 to about 4 mole percent UO 2 ; and f. the balance SiO 2 ; with the proviso that there is present in the composition at least about 2 mole percent of at least one oxide selected from the group consisting of Pr 2 O 3 and Nb 2 O 5 .
Claim 3
Dependent Claim
150 words
The composition of claim 1 which consists essentially of: a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from 0 to about 6 mole percent La 2 O 3 ; d. from about 2 to about 8 mole percent Pr 2 O 3 ; e. from about 2 to about 8 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; f. from 0 to about 4 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of La 2 O 3 and Pr 2 O 3 is equal to or less than about 12.
Claim 4
Dependent Claim
123 words
The composition of claim 2 which consists essentially of: a. from about 31 to about 35 mole percent Li 2 O; b. from about 1 to about 3 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from 0 to about 4 mole percent La 2 O 3 ; d. from about 3 to about 6 mole percent Pr 2 O 3 ; e. from about 4 to about 8 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; f. from 0 to about 2 mole percent UO 2 ; and g. the balance SiO 2 .
Claim 5
Dependent Claim
44 words
The composition of claim 3 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , and 53 mole percent SiO 2 .
Claim 6
Dependent Claim
50 words
The composition of claim 3 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , 2 mole percent UO 2 , and 51 mole percent SiO 2 .
Claim 7
Dependent Claim
52 words
The composition of claim 3 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 3 mole percent La 2 O 3 , 3 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , and 53 mole percent SiO 2 .
Claim 8
Dependent Claim
134 words
The composition of claim 1 which consists essentially of: a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 8 mole percent La 2 O 3 ; d. from 0 to about 6 mole percent Ta 2 O 5 ; e. from about 2 to about 8 mole percent Nb 2 O 5 ; f. from 0 to about 4 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of Ta 2 O 5 and Nb 2 O 5 is equal to or less than about 10.
Claim 9
Dependent Claim
135 words
The composition of claim 7 which consists essentially of: a. from about 31 to about 35 mole percent Li 2 O; b. from about 1 to about 3 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 3 to about 7 mole percent La 2 O 3 ; d. from 0 to about 4 mole percent Ta 2 O 5 ; e. from about 2 to about 7 mole percent Nb 2 O 5 ; f. from 0 to about 2 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of Ta 2 O 5 and Nb 2 O 5 is equal to or less than about 10.
Claim 10
Dependent Claim
52 words
The composition of claim 8 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent La 2 O 3 , 3 mole percent Ta 2 O 5 , 3 mole percent Nb 2 O 5 , and 53 mole percent SiO 2 .
Claim 11
Dependent Claim
43 words
The composition of claim 8 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent La 2 O 3 , 6 mole percent Nb 2 O 5 and 53 mole percent SiO 2 .
Claim 12
Dependent Claim
44 words
The composition of claim 8 which consists essentially of 33 mole percent Li 2 O, 2 mole percent Rb 2 O, 6 mole percent La 2 O 3 , 6 mole percent Nb 2 O 5 , and 53 mole percent SiO 2 .
Claim 13
Dependent Claim
175 words
A glass electrode having a pH-responsive membrane of glass having a composition consisting essentially of (in mole percent on the oxide basis): a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 12 mole percent of at least one oxide selected from the group consisting of La 2 O 3 and Pr 2 O 3 ; d. from about 2 to about 10 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; e. from 0 to about 4 mole percent UO 2 ; and f. the balance SiO 2 ; with the proviso that there is present in the composition at least about 2 mole percent of at least one oxide selected from the group consisting of Pr 2 O 3 and Nb 2 O 5 .
Claim 14
Dependent Claim
175 words
A glass electrode having a pH-responsive membrane of glass having a composition consisting essentially of (in mole percent on the oxide basis): a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 12 mole percent of at least one oxide selected from the group consisting of La 2 O 3 and Pr 2 O 3 ; d. from about 2 to about 10 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; e. from 0 to about 4 mole percent UO 2 ; and f. the balance SiO 2 ; with the proviso that there is present in the composition at least about 2 mole percent of at least one oxide selected from the group consisting of Pr 2 O 3 and Nb 2 O 5 .
Claim 15
Dependent Claim
159 words
The electrode of claim 12, in which the pH-responsive membrane of glass has a composition consisting essentially of: a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from 0 to about 6 mole percent La 2 O 3 ; d. from about 2 to about 8 mole percent Pr 2 O 3 ; e. from about 2 to about 8 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; f. from 0 to about 4 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of La 2 O 3 and Pr 2 O 3 is equal to or less than about 12.
Claim 16
Dependent Claim
131 words
The electrode of claim 13, in which the pH-responsive membrane of glass has a composition consisting essentially of: a. from about 31 to about 35 mole percent Li 2 O; b. from about 1 to about 3 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from 0 to about 4 mole percent La 2 O 3 ; from about 3 to about 6 mole percent Pr 2 O 3 ; e. from about 4 to about 8 mole percent of at least one oxide selected from the group consisting of Ta 2 O 5 and Nb 2 O 5 ; f. from 0 to about 2 mole percent UO 2 ; and g. the balance SiO 2 .
Claim 17
Dependent Claim
53 words
The electrode of claim 14, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , and 53 mole percent SiO 2 .
Claim 18
Dependent Claim
59 words
The electrode of claim 14, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , 2 mole percent UO 2 , and 51 mole percent SiO 2 .
Claim 19
Dependent Claim
61 words
The electrode of claim 14, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 3 mole percent La 2 O 3 , 3 mole percent Pr 2 O 3 , 6 mole percent Ta 2 O 5 , and 53 mole percent SiO 2 .
Claim 20
Dependent Claim
142 words
The electrode of claim 12, in which the pH-responsive membrane of glass has a composition consisting essentially of: a. from about 30 to about 37 mole percent Li 2 O; b. from 0 to about 4 mole-percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 2 to about 8 mole percent La 2 O 3 ; d. from 0 to about 6 mole percent Ta 2 O 5 ; e. from about 2 to about 8 mole percent Nb 2 O 5 ; f. from 0 to about 4 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of Ta 2 O 5 and Nb 2 O 5 is equal to or less than about 10.
Claim 21
Dependent Claim
144 words
The electrode of claim 18, in which the pH-responsive membrane of glass has a composition consisting essentially of: a. from about 31 to about 35 mole percent Li 2 O; b. from about 1 to about 3 mole percent of at least one oxide selected from the group consisting of Cs 2 O and Rb 2 O; c. from about 3 to about 7 mole percent La 2 O 3 ; d. from 0 to about 4 mole percent Ta 2 O 5 ; e. from about 2 to about 7 mole percent Nb 2 O 5 ; f. from 0 to about 2 mole percent UO 2 ; and g. the balance SiO 2 ; with the proviso that the sum of the mole percentages of Ta 2 O 5 and Nb 2 O 5 is equal to or less than about 10.
Claim 22
Dependent Claim
61 words
The electrode of claim 19, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole percent La 2 O 3 , 3 mole percent Ta 2 O 5 , 3 mole percent Nb 2 O 5 , and 53 mole percent SiO 2 .
Claim 23
Dependent Claim
53 words
The electrode of claim 19, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Cs 2 O, 6 mole precent La 2 O 3 , 6 mole percent Nb 2 O 5 , and 53 mole precent SiO 2 .
Claim 24
Dependent Claim
53 words
The electrode of claim 19, in which the pH-responsive membrane of glass has a composition consisting essentially of 33 mole percent Li 2 O, 2 mole percent Rb 2 O, 6 mole percent La 2 O 3 , 6 mole percent Nb 2 O 5 , and 53 mole percent SiO 2 .
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |