US3713992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
GLASS ELECTRODE FOR DETERMINING pH VALUE AT SUPER HIGH TEMPERATURES
Assignee: Individual
•
Filing: 1970-03-11
•
Granted: 1973-01-30
•
Expires: 1990-03-11
Abstract
Abstract A glass electrode used for determining pH-values particularly at elevated temperatures, the active part of which is formed of a glass membrane composed of a glass that comprises as essential constituents 50-70 percent SiO2, 10-20 percent Li2O, 7-20 percent BaO, and 3-10 percent UO3, and also 0-5 percent of an oxide or oxides selected from the group consisting of NiO, Nd2O3, La2O3, Cr2O3, ThO2, ZrO2, TiO2, MnO2, Co3O4, Ta2O5, and Nb2O5.
Inventors
- 👤 T Akazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C4/00; C03C4/18; Y; Y10; Y10S; Y10S65/00; Y10S65/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
A glass electrode for determining pH values at a temperature of 100* to 150*C comprising a pH-responsive membrane formed of a mixture consisting essentially of 50-70 percent SiO2, 10-20 percent Li2O, 7-20 percent BaO, and 3-10 percent UO3.
Claim 2
Dependent Claim
38 words
A glass electrode for determining pH values at a temperature of 100* to 150*C comprising a pH-responsive membrane formed of a mixture consisting essentially of 50-70 percent SiO2, 10-20 percent Li2O, 7-20 percent BaO, and 3-10 percent UO3.
Claim 3
Dependent Claim
21 words
A glass electrode in accordance with claim 1, in which said pH-responsive glass membrane is attached to an electrode-supporting glass tube.
Claim 4
Dependent Claim
66 words
A glass electrode for determing pH values at a temperature 100* to 150* C comprising a pH-responsive membrane formed of a mixture consisting essentially of 50-70 percent SiO2, 10 20 percent Li2O 7-20 percent BaO, 3-10 percent UO3, and up to 5 percent of at least one oxide selected from the group consisting of NiO, Nd2O3, Cr2O3, Tho2, La2O3, ZrO2, TiO2, MnO2, Co3O4, Ta2O5, and Nb2O5.
Claim 5
Dependent Claim
66 words
A glass electrode for determing pH values at a temperature 100* to 150* C comprising a pH-responsive membrane formed of a mixture consisting essentially of 50-70 percent SiO2, 10 20 percent Li2O 7-20 percent BaO, 3-10 percent UO3, and up to 5 percent of at least one oxide selected from the group consisting of NiO, Nd2O3, Cr2O3, Tho2, La2O3, ZrO2, TiO2, MnO2, Co3O4, Ta2O5, and Nb2O5.
Claim 6
Dependent Claim
21 words
A glass electrode in accordance with claim 3, in which said pH-responsive glass membrane is attached to an electrode-supporting glass tube.
Claim 7
Independent Claim
59 words
A method of measuring the pH value of fluid at a temperature of 100* to 150* C comprising contacting said fluid at said temperature with a glass electrode having a membrane of a composition consisting essentially of 50-70 percent SiO2, 10-20 percent Li2O 7-20 percent BaO, and 3-10 percent UO3 and determining the electromotive force produced by said electrode.
Claim 8
Independent Claim
59 words
A method of measuring the pH value of fluid at a temperature of 100* to 150* C comprising contacting said fluid at said temperature with a glass electrode having a membrane of a composition consisting essentially of 50-70 percent SiO2, 10-20 percent Li2O 7-20 percent BaO, and 3-10 percent UO3 and determining the electromotive force produced by said electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |