US4601883A
Expired / Lapsed
US
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Sensor element
Assignee: Panasonic Holdings Corp
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Filing: 1985-06-05
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Granted: 1986-07-22
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Expires: 2005-06-05
Abstract
Abstract A sensor element comprising a substrate made of a compound oxide of the perovskite type, the compound oxide having the formula A 1-x A' x B 1-y B' y O 3 in which A represents a trivalent element selected from the group consisting of La, Ce, Pr and Nd, A' represents a divalent element selected from the group consisting of Ca, Sr and Ba, B represents equal amounts of trivalent and tetravalent Co, B' represents a tetravalent element selected from the group consisting of Fe, Mn, V and Ti, x has a value ranging from (0.6) to (0.95) and y has a value ranging from (0.2) to (0.9) with the proviso that x must equal 1/2(1+y).
Inventors
- 👤 Satoshi Sekido
- 👤 Hirokazu Tachibana
- 👤 Yoshito Ninomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:56
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A sensor element which comprises a porous substrate made of a compound oxide of the perovskite type and a pair of electrodes electrically connected to said substrate in a spaced relation with each other, the compound oxide having the formula A 1-x A' x B 1-y B' y O 3 in which A represents a trivalent element selected from the group consisting of La, Ce, Pr and Nd, A' represents a divalent element selected from the group consisting of Ca, Sr and Ba, B represents equal amounts of trivalent and tetravalent Co, B' represents (a tetravalent element selected from the group consisting of Fe, Mn, V and Ti, x has a value ranging from 0.6 to 0.95 and y has a value ranging from 0.2 to 0.9 with the proviso that x must equal 1/2 (1+y).
Claim 2
Dependent Claim
136 words
A sensor element which comprises a porous substrate made of a compound oxide of the perovskite type and a pair of electrodes electrically connected to said substrate in a spaced relation with each other, the compound oxide having the formula A 1-x A' x B 1-y B' y O 3 in which A represents a trivalent element selected from the group consisting of La, Ce, Pr and Nd, A' represents a divalent element selected from the group consisting of Ca, Sr and Ba, B represents equal amounts of trivalent and tetravalent Co, B' represents (a tetravalent element selected from the group consisting of Fe, Mn, V and Ti, x has a value ranging from 0.6 to 0.95 and y has a value ranging from 0.2 to 0.9 with the proviso that x must equal 1/2 (1+y).
Claim 3
Dependent Claim
19 words
A sensor element according to claim 1, wherein the element A is La and the element A' is Sr.
Claim 4
Dependent Claim
53 words
A sensor element according to claim 1, wherein y is in the range of 0.2 to 0.4 when said sensor is to be used in an atmosphere where CO gas is rich and y is 0.9 when said sensor is to be used in an atmosphere where hydrocarbons or H 2 is rich.
Claim 5
Dependent Claim
26 words
A sensor element according to claim 1, wherein said pair of electrodes are each made of an alloy of Pt or Pd and Ag or Cu.
Claim 6
Dependent Claim
37 words
A sensor element of claim 1 connected in series to a power circuit together with an actuator solenoid whereby said actuator solenoid can be worked in response to an abrupt variation in resistance of said sensor element.
References Cited (Backward Citations)
US3900428A
Cited
US3901828A
Cited
US3951603A
Cited
US4049583A
Cited
US4221827A
Cited
US4314996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |