US4086556A
Expired / Lapsed
US
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Humidity sensitive ceramic resistor
Assignee: Panasonic Holdings Corp
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Filing: 1976-09-02
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Granted: 1978-04-25
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Expires: 1996-09-02
Abstract
Abstract There is provided a humidity sensitive ceramic resistor having high humidity activity, low electrical resistance, quick response rate to humidity and high stability with respect to time, temperature, humidity and electric load which is suited for humidity-controlling devices. The ceramic resistor comprises a ceramic composition comprising at least one component having a spinel type cubic symmetry selected from the group consisting of MgCr2O4, FeCr2O4, NiCr2O4, CoCr2O4, MnCr2O4, CuCr2O4, Mg2TiO4, Zn2TiO4, Mg2SnO4 and Zn2SnO4, and , if desired, at least one component selected from the group consisting of TiO2, ZrO2, HfO2 and SnO2.
Inventors
- 👤 Tsuneharu Nitta
- 👤 Ziro Terada
- 👤 Shigeru Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:04
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
82 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, at least one main component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 and, Mg 2 TiO 4 , Mg 2 SnO 4 .
Claim 2
Dependent Claim
82 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, at least one main component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 and, Mg 2 TiO 4 , Mg 2 SnO 4 .
Claim 3
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of MgCr 2 O 4 .
Claim 4
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of FeCr 2 O 4 .
Claim 5
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of NiCr 2 O 4 .
Claim 6
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of CoCr 2 O 4 .
Claim 7
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of MnCr 2 O 4 .
Claim 8
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of CuCr 2 O 4 .
Claim 9
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of Mg 2 TiO 4 .
Claim 10
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of Mg 2 SnO 4 .
Claim 11
Dependent Claim
105 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, said ceramic plate consisting essentially of, as solid ingredients, 1 to 99 mole percent of at least one component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 , Mg 2 TiO 4 , Mg 2 SnO 4 and 99 to 1 mole percent of TiO 2 .
Claim 12
Dependent Claim
105 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, said ceramic plate consisting essentially of, as solid ingredients, 1 to 99 mole percent of at least one component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 , Mg 2 TiO 4 , Mg 2 SnO 4 and 99 to 1 mole percent of TiO 2 .
Claim 13
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of MgCr 2 O 4 .
Claim 14
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of FeCr 2 O 4 .
Claim 15
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of NiCr 2 O 4 .
Claim 16
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of CoCr 2 O 4 .
Claim 17
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of MnCr 2 O 4 .
Claim 18
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of CuCr 2 O 4 .
Claim 19
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of Mg 2 TiO 4 .
Claim 20
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of Mg 2 SnO 4 .
Claim 21
Dependent Claim
116 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, 60 to 99 mole percent of at least one main component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 , Mg 2 TiO 4 , Mg 2 SnO 4 , and 1 to 40 mole percent of at least one additional metal oxide selected from the group consisting of SnO 2 , ZrO 2 and HfO 2 .
Claim 22
Dependent Claim
116 words
A humidity sensitive ceramic resistor comprising a ceramic plate having a conducting electrode secured to a surface thereof, said ceramic plate consisting essentially of, as solid ingredients, 60 to 99 mole percent of at least one main component having spinel-type cubic symmetry selected from the group consisting of MgCr 2 O 4 , FeCr 2 O 4 , NiCr 2 O 4 , CoCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 , Mg 2 TiO 4 , Mg 2 SnO 4 , and 1 to 40 mole percent of at least one additional metal oxide selected from the group consisting of SnO 2 , ZrO 2 and HfO 2 .
Claim 23
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of MgCr 2 O 4 .
Claim 24
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of FeCr 2 O 4 .
Claim 25
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of NiCr 2 O 4 .
Claim 26
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of CoCr 2 O 4 .
Claim 27
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of MnCr 2 O 4 .
Claim 28
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of CuCr 2 O 4 .
Claim 29
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of Mg 2 TiO 4 .
Claim 30
Dependent Claim
21 words
A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of Mg 2 SnO 4 .
Claim 31
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of SnO 2 .
Claim 32
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of ZrO 2 .
Claim 33
Dependent Claim
20 words
A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of HfO 2 .
References Cited (Backward Citations)
US3766098A
Cited
US3926858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |