US4277322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen sensor
Assignee: UNITED PROCESS CONTROL Inc
•
Filing: 1980-02-04
•
Granted: 1981-07-07
•
Expires: 2000-02-04
Abstract
Abstract A metal film electrode on the outer surface of an electroded, oxygen-ion-conducting solid electrolyte, closed end portion of an oxygen sensor tube is maintained in contact with the electrolyte and in its electrical conducting function by a compressible, porous, ceramic boot firmly press-fit onto and over the electroded end portion in slidable and frictional engagement with the outer film electrode (including any connector or reinforcing wire therein or thereon). Boot has open porosity of greater than 50 (or 80) volume percent and can consist essentially of zirconia, such as a sintered mass of zirconia fibers.
Inventors
- 👤 William T. Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:51
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
An oxygen sensor comprising a tubular body having a closed end and an opposite open end, an electroded portion of the body including the closed end and comprising a solid oxygen-ion-conducting electrolyte with metal film electrodes attached on the outer and inner surfaces of the electrolyte, a compressible, porous, ceramic boot firmly press-fit onto and over the electroded portion in slidable and frictional engagement with the electrode on the outer surface of the electrolyte so as to maintain contact between the electrolyte and the electrode on the outer surface of the electrolyte and to maintain the electrical conducting function of that electrode, and the ceramic of the boot being nonreactive with the metal electrode in
Claim 2
Dependent Claim
115 words
An oxygen sensor comprising a tubular body having a closed end and an opposite open end, an electroded portion of the body including the closed end and comprising a solid oxygen-ion-conducting electrolyte with metal film electrodes attached on the outer and inner surfaces of the electrolyte, a compressible, porous, ceramic boot firmly press-fit onto and over the electroded portion in slidable and frictional engagement with the electrode on the outer surface of the electrolyte so as to maintain contact between the electrolyte and the electrode on the outer surface of the electrolyte and to maintain the electrical conducting function of that electrode, and the ceramic of the boot being nonreactive with the metal electrode in
Claim 3
Dependent Claim
14 words
The sensor of claim 1 wherein the boot has an open porosity of greater
Claim 4
Dependent Claim
12 words
The sensor of claim 1 wherein the ceramic of the boot consists
Claim 5
Dependent Claim
12 words
The sensor of claim 1 wherein the boot consists essentially of a
Claim 6
Dependent Claim
14 words
The sensor of claim 4 wherein the boot has an open porosity of greater
Claim 7
Dependent Claim
11 words
The sensor of claim 1 wherein the electrolyte is stabilized zirconia.
Claim 8
Dependent Claim
220 words
An oxygen sensor device comprising a casing having an inlet for entry thereinto of gas atmosphere to be monitored and which contains platinum group metal contaminants, an oxygen sensor within the casing and comprising a tubular body with an electroded portion and a compressible porous, ceramic boot, the tubular body having a closed end and an opposite open end, the electroded portion including the closed end and comprising a solid oxygen-ion-conducting electrolyte with film electrodes of platinum group metal attached on the outer and inner surfaces of the electrolyte, the ceramic boot firmly press-fit onto and over the electroded portion in slidable and frictional engagement with the electrode on the outer surface of the electrolyte so as to maintain contact between the electrolyte and the electrode on the outer surface of the electrolyte and to maintain the electrical conducting function of that electrode, the ceramic of the boot being nonreactive with the platinum group metal electrode in contact with the boot, and a platinum group metal contaminant getter consisting essentially of the same platinum group metal as in the electrode on the outer surface of the electrolyte and arranged in the casing between the inlet and the electroded portion so that the atmosphere to be monitored passes into contact with the getter to effect gettering of the platinum group metal
Claim 9
Dependent Claim
220 words
An oxygen sensor device comprising a casing having an inlet for entry thereinto of gas atmosphere to be monitored and which contains platinum group metal contaminants, an oxygen sensor within the casing and comprising a tubular body with an electroded portion and a compressible porous, ceramic boot, the tubular body having a closed end and an opposite open end, the electroded portion including the closed end and comprising a solid oxygen-ion-conducting electrolyte with film electrodes of platinum group metal attached on the outer and inner surfaces of the electrolyte, the ceramic boot firmly press-fit onto and over the electroded portion in slidable and frictional engagement with the electrode on the outer surface of the electrolyte so as to maintain contact between the electrolyte and the electrode on the outer surface of the electrolyte and to maintain the electrical conducting function of that electrode, the ceramic of the boot being nonreactive with the platinum group metal electrode in contact with the boot, and a platinum group metal contaminant getter consisting essentially of the same platinum group metal as in the electrode on the outer surface of the electrolyte and arranged in the casing between the inlet and the electroded portion so that the atmosphere to be monitored passes into contact with the getter to effect gettering of the platinum group metal
Claim 10
Dependent Claim
46 words
The device of claim 7 wherein the getter comprises a thin-walled honeycomb body extending across the casing, having a plurality of passages arranged for the atmosphere to pass therethrough, and having the platinum group metal of the getter contained on the walls of the passages and
Claim 11
Dependent Claim
14 words
The device of claim 7 wherein the boot has an open porosity of greater
Claim 12
Dependent Claim
15 words
The device of claim 7 wherein the ceramic of the boot consists essentially of zirconia.
References Cited (Backward Citations)
US3645875A
Cited
US3978006A
Cited
US3819500A
Cited
US4021326A
Cited
US3935089A
Cited
DE2351815A1
Cited
US4097353A
Cited
US4121988A
Cited
US4101404A
Cited
JPS5329188A
Cited
DE2738882A1
Cited
US4126532A
Cited
US4164462A
Cited
US4121989A
Cited
US4080276A
Cited
US4140611A
Cited
US4198279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |