Patent US1809087A successfully refreshed from Google Patents.
US4292158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor of the polarographic type, particularly for use with internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1980-06-09
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Granted: 1981-09-29
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Expires: 2000-06-09
Abstract
Abstract To simplify manufacture and provide a polarographic sensor of high response speed, operating according to the current limiting principle, an oxygen molecule migration barrier is provided leading to the cathode by separating the cathode from the space where the gas to be tested exists by a wall through which a hole is provided which extends therethrough to a small space immediately above the cathode defined by support elements placed immediately on the cathode. The hole, or a plurality of holes, is so dimensioned that the diameter thereof, with respect to its length, is small, with diameters of between 0.01 to 0.06 mm and a length of at least about 1 mm being suitable.
Inventors
- 👤 Klaus Muller
- 👤 Helmut Maurer
- 👤 Hermann Dietz
- 👤 Karl-Hermann Friese
- 👤 Wolfgang Leibfried
- 👤 Gunther Stecher
- 👤 Ernst Linder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4075; G01N27/4071; G01N27/4072; G01N27/416; G01N27/48; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
180 words
Polarographic sensor to determine the oxygen content of gases, particularly combustion gases, especially when emanating from an internal combustion engine, and operating in accordance with diffusion limiting current principle having a solid electrolyte body (4, 16, 46); an anode electrode (3) applied to a surface portion of said body; a cathode electrode (2) applied to another surface portion of said body; means (9, 9') adapted to apply a voltage across said electrodes; means (15, 16, 46) forming a wall separating the cathode from an ambient space in which the gas, the oxygen of which is to be determined, occurs, and an opening formed in said wall to conduct oxygen molecules to the cathode, comprising, in accordance with the invention, support elements (5) located between the cathode and said wall and defining, therebetween, a system of intermediate distribution or dispersion spaces (6); and wherein the opening in said wall comprises at least one hole (1,31) which has a length which is long in relation to the diameter of the hole and is in gas communication with said distribution or dispersion spaces.
Claim 2
Dependent Claim
180 words
Polarographic sensor to determine the oxygen content of gases, particularly combustion gases, especially when emanating from an internal combustion engine, and operating in accordance with diffusion limiting current principle having a solid electrolyte body (4, 16, 46); an anode electrode (3) applied to a surface portion of said body; a cathode electrode (2) applied to another surface portion of said body; means (9, 9') adapted to apply a voltage across said electrodes; means (15, 16, 46) forming a wall separating the cathode from an ambient space in which the gas, the oxygen of which is to be determined, occurs, and an opening formed in said wall to conduct oxygen molecules to the cathode, comprising, in accordance with the invention, support elements (5) located between the cathode and said wall and defining, therebetween, a system of intermediate distribution or dispersion spaces (6); and wherein the opening in said wall comprises at least one hole (1,31) which has a length which is long in relation to the diameter of the hole and is in gas communication with said distribution or dispersion spaces.
Claim 3
Dependent Claim
16 words
Sensor according to claim 1, wherein the support elements (5), in plan view, are approximately square.
Claim 4
Dependent Claim
54 words
Sensor according to claim 1, wherein the hole, or holes, has a diameter of between 0.01 to 0.06 mm, and a length of at least 1 mm; and wherein the spaces (6) have a height of between 0.01 and 0.05 mm, and a width, between the support elements, of between 0.2 to 0.5 mm.
Claim 5
Dependent Claim
101 words
Sensor according to claim 1, wherein a plurality of holes (1, 31) are provided, spaced from each other by at least 1 mm, and distributed over the surface of said wall in an approximate grid pattern, the diameter of said holes being in the order of about 0.01 to 0.02 mm and have a length of more than 1 mm; and wherein the height of the spaces (6) is approximately of the same order of magnitude as the diameter of the holes, the spaces between the support elements (5) being about 10 to 50 times the height of the spaces (6).
Claim 6
Dependent Claim
14 words
Sensor according to claim 1, wherein the support elements (5) comprise electron conductive material.
Claim 7
Dependent Claim
26 words
Sensor according to claim 5, wherein the support elements are made of the same material as that of the electrode with which they are in contact.
Claim 8
Dependent Claim
28 words
Sensor according to claim 1, wherein the electrodes (2, 3) comprise at least one of the materials selected from the group consisting of platinum and platinum-zirconium dioxide mixture.
Claim 9
Dependent Claim
19 words
Sensor according to claim 7, wherein the support elements (5) comprise the same material as that of the electrodes.
Claim 10
Dependent Claim
34 words
Sensor according to claim 1, further comprising a platinum coating (7) located at the surface of the wall facing the cathode, in engagement with said support elements, and electrically conductively connected to the cathode.
Claim 11
Dependent Claim
21 words
Sensor according to claim 9, further including a frame (8) laterally surrounding the cathode (2), made of a non electrode material.
Claim 12
Dependent Claim
21 words
Sensor according to claim 1, further includes a frame (8) laterally surrounding the cathode (2), made of a non electrode material.
Claim 13
Dependent Claim
32 words
Sensor according to claim 1, wherein the means defining said wall and the solid electrolyte body comprise the same element 16, 46 and said hole (31) extends through the solid electrolyte body.
Claim 14
Dependent Claim
37 words
Sensor according to claim 12, further comprising gas-impervious cover means (14') formed with a hole therethrough and positioned over said solid electrolyte body, the hole through said cover means matching the hole through the solid electrolyte body.
Claim 15
Dependent Claim
20 words
Sensor according to claim 13, further comprising a connecting duct (11') leading through said cover means to said hole (31).
Claim 16
Dependent Claim
55 words
Sensor according to claim 1, further comprising anode spacing support elements (5') positioned over the anode (3); means (3, 14') covering the anode support elements (5') at the side remote from the anode (3) to define anode spaces; and duct means (11) providing communication between said anode spaces and the ambient space surrounding the sensor.
Claim 17
Dependent Claim
21 words
Sensor according to claim 1, wherein the means defining said wall comprises a carrier or support plate (15) of ceramic material.
Claim 18
Dependent Claim
34 words
Sensor according to claim 1, wherein said at least one hole (1, 31) has a terminal portion extending in a plane essentially transverse to the surface portion on which the cathode electrode is applied.
Claim 19
Dependent Claim
36 words
Sensor according to claim 1, wherein said at least one hole (1, 31) extends at essentially a right angle with respect to the surface portion of said body to which said cathode electrode (2) is applied.
References Cited (Backward Citations)
GB1523550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |