US4571285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor for and method of determining concentration of oxygen
Assignee: Fujikura Ltd
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Filing: 1985-05-24
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Granted: 1986-02-18
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Expires: 2005-05-24
Abstract
Abstract An oxygen sensor for determining the partial pressure of oxygen in a monitored gas environment includes a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of the conductive plate, and a sealing glass material sealingly bonding the conductive plate at one side to the housing to provide a diffusion chamber defined by the diffusion housing and the conductive plate. The electrodes are connectable to a power source for being supplied with an electric potential to pump oxygen ion out of the diffusion chamber through the conductive plate to flow a current through the electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment. The sealing glass material contains SiO 2 , BaO, Na 2 O and ZrO 2 .
Inventors
- 👤 Mitsuhiro Nakazawa
- 👤 Hiroshi Osanai
- 👤 Yoshiya Isono
- 👤 Akiyoshi Asada
- 👤 Hitoshi Ohira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:56
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4065; G01N27/407; G01N27/4071; G01N27/4072
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
An oxygen sensor for determining the partial pressure of oxygen in a monitored gas environment which comprises a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of said conductive plate, and a sealing glass material sealingly bonding said conductive plate at one side to said housing to provide a diffusion chamber defined by said diffusion housing and said conductive plate, said electrodes being connectable to a power source for being supplied with an electric potential to pump oxygen ion out of said diffusion chamber through said conductive plate to flow a current through said electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment, and said sealing glass material containing SiO 2 , BaO, Na 2 O and ZrO 2 .
Claim 2
Dependent Claim
149 words
An oxygen sensor for determining the partial pressure of oxygen in a monitored gas environment which comprises a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of said conductive plate, and a sealing glass material sealingly bonding said conductive plate at one side to said housing to provide a diffusion chamber defined by said diffusion housing and said conductive plate, said electrodes being connectable to a power source for being supplied with an electric potential to pump oxygen ion out of said diffusion chamber through said conductive plate to flow a current through said electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment, and said sealing glass material containing SiO 2 , BaO, Na 2 O and ZrO 2 .
Claim 3
Dependent Claim
39 words
An oxygen sensor according to claim 1, in which said sealing glass material is prepared by the steps of providing amorphous glass containing SiO 2 , BaO and Na 2 O and adding zirconia powder to said amorphous glass.
Claim 4
Dependent Claim
45 words
An oxygen sensor according to claim 2, in which said amorphous glass contains 70.6% by weight of SiO 2 , 10.7% of BaO, 7.3% of Na 2 O, 5.7% of K 2 O, 2.8% of Al 2 O 3 and 1.5% of Li 2 O.
Claim 5
Dependent Claim
22 words
An oxygen sensor according to claim 2, in which said zirconia powder has a particle size of not more than 3 μm.
Claim 6
Dependent Claim
26 words
An oxygen sensor according to claim 1 or claim 2, in which the zirconia content of said sealing glass material is 1 to 30% by weight.
Claim 7
Independent Claim
254 words
A method of determining the partial pressure of oxygen in a monitored gas environment which comprises the steps of: (a) providing an oxygen sensor which comprises a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of said conductive plate, heating means mounted on said housing, and a sealing glass material sealingly bonding said conductive plate at one side to said housing to provide a diffusion chamber defined by said diffusion housing and said conductive plate, said electrodes being connectable to a power source for being supplied with an electric potential to pump oxygen ion out of said diffusion chamber through said conductive plate to flow a current through said electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment, said sealing glass material containing SiO 2 , BaO, Na 2 O and ZrO 2 , each of said oxygen ion conductive plate having a thickness of 0.08 to 0.8 mm, each of said electrode layers having a circular shape and a diameter of not more than 7 mm, and said gas diffusion aperture having a length of 1 mm and a diameter of 10 to 50 μm; and (b) operating said heating means to maintain said oxygen sensor at temperatures of about 350° C. to about 450° C. and operating said oxygen sensor to determine the partial pressure of the oxygen in the monitored gas environment.
Claim 8
Independent Claim
254 words
A method of determining the partial pressure of oxygen in a monitored gas environment which comprises the steps of: (a) providing an oxygen sensor which comprises a diffusion housing of zirconia based material having a gas diffusion aperture, an oxygen ion conductive plate of zirconia based material, a pair of electrode layers mounted on opposite sides of said conductive plate, heating means mounted on said housing, and a sealing glass material sealingly bonding said conductive plate at one side to said housing to provide a diffusion chamber defined by said diffusion housing and said conductive plate, said electrodes being connectable to a power source for being supplied with an electric potential to pump oxygen ion out of said diffusion chamber through said conductive plate to flow a current through said electrodes which current is indicative of the partial pressure of the oxygen in the monitored gas environment, said sealing glass material containing SiO 2 , BaO, Na 2 O and ZrO 2 , each of said oxygen ion conductive plate having a thickness of 0.08 to 0.8 mm, each of said electrode layers having a circular shape and a diameter of not more than 7 mm, and said gas diffusion aperture having a length of 1 mm and a diameter of 10 to 50 μm; and (b) operating said heating means to maintain said oxygen sensor at temperatures of about 350° C. to about 450° C. and operating said oxygen sensor to determine the partial pressure of the oxygen in the monitored gas environment.
References Cited (Backward Citations)
US4310402A
Cited
US4381224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |