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US4424508A
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Moisture sensitive element
Assignee: Toshiba Corp
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Filing: 1981-08-10
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Granted: 1984-01-03
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Expires: 2001-08-10
Abstract
Abstract A moisture sensitive element for detecting humidity variations through sensing variations in electric resistance using a porous metal oxide ceramic. At least either phorphorus or sulfur is incorporated in and supported by the porous metal oxide ceramic with the phosphorus or sulfur being applied in either a pure or oxide form.
Inventors
- 👤 Mituo Harata
- 👤 Masaki Katsura
- 👤 Shigeki Uno
- 👤 Hideaki Hiraki
- 👤 Masayuki Shiratori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:13
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
44 words
A moisture sensitive element comprising: a porous metal oxide ceramic; and at least one of phosphorus and sulfur in at least one of a pure and oxide form, said at least one of phosphorus and sulfur being supported by said porous metal oxide ceramic.
Claim 2
Dependent Claim
44 words
A moisture sensitive element comprising: a porous metal oxide ceramic; and at least one of phosphorus and sulfur in at least one of a pure and oxide form, said at least one of phosphorus and sulfur being supported by said porous metal oxide ceramic.
Claim 3
Dependent Claim
29 words
A moisture sensitive element according to claim 1, wherein the elemental amount of said at least one of phosphorus and sulfur is about 0.1 to about 2.0 weight percent.
Claim 4
Dependent Claim
42 words
A moisture sensitive element according to claim 1, wherein said phosphorus and sulfur are both supported by said porous metal oxide ceramic, and the added amount of the combination of said phosphorus and sulfur is about 0.1 to about 2.0 weight percent.
Claim 5
Dependent Claim
58 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic is the metal oxide selected from the group consisting of ZnO, Fe 2 O 3 , SnO 2 , Cr 2 O 3 , Fe 3 O 4 , MgO.Cr 2 O 3 , BaO.TiO 2 and MnO.Fe 2 O 3 .
Claim 6
Dependent Claim
51 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 70 to about 99 mole percent of ZnO and about 1 to about 30 mole percent of at least one metal oxide selected from the group consisting of MgO, CaO, CoO, and MnO.
Claim 7
Dependent Claim
58 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 40 to about 99 mole percent of ZnO, and about 1 to about 60 mole percent of at least one metal oxide selected from the group consisting of TiO 2 , SnO 2 , ZrO 2 and SiO 2 .
Claim 8
Dependent Claim
45 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramics comprises about 60 to about 90 mole percent of ZnO and about 10 to about 40 mole percent of at least one either WO 3 or MoO 3 .
Claim 9
Dependent Claim
48 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 60 to about 99 mole percent of ZnO and about 1 to about 40 mole percent of at least either Cr 2 O 3 or Fe 2 O 3 .
Claim 10
Dependent Claim
40 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 85 to about 95 mole percent of ZnO and about 5 to about 15 mole percent of V 2 O 5 .
Claim 11
Dependent Claim
55 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 50 to about 99.9 mole percent of SnO 2 and about 0.1 to about 50 mole percent of at least one metal oxide selected from the group consisting of MgO, CaO, CoO, MnO, SrO, NiO and CuO.
Claim 12
Dependent Claim
45 words
A moisture sensitive element according to claims 1 or 2, wherein the porous metal oxide ceramic comprises about 60 to about 99.9 mole percent of SnO 2 and about 0.1 to about 40 mole percent of at least either WO 3 or MoO 3 .
Claim 13
Dependent Claim
63 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 60 to about 99.9 mole percent of SnO 2 and about 0.1 to about 40 mole percent of at least one metal oxide selected from the group consisting of Al 2 O 3 , Ga 2 O 3 , and In 2 O 3 .
Claim 14
Dependent Claim
62 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramics comprises about 75 to about 99.9 mole percent of SnO 2 and about 0.1 to about 25 mole percent of at least one metal oxide selected from the group consisting of V 2 O 5 , Nb 2 O 5 and Ta 2 O 5 .
Claim 15
Dependent Claim
54 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 30 to about 80 mole percent of Cr 2 O 3 and about 20 to about 70 mole percent of at least one metal oxide selected from the group consisting of MgO, NiO, CoO and MnO.
Claim 16
Dependent Claim
61 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 40 to about 80 mole percent of Cr 2 O 3 and about 20 to about 60 mole percent of at least one metal oxide selected from the group consisting of TiO 2 , SnO 2 , ZrO 2 and SiO 2 .
Claim 17
Dependent Claim
48 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 60 to about 90 mole percent of Cr 2 O 3 and about 10 to about 30 mole percent of at least one of WO 3 and MoO 3 .
Claim 18
Dependent Claim
64 words
A moisture sensitive element according to claim 1 or 2, wherein the porous metal oxide ceramic comprises about 70 to about 90 moler percent of Cr 2 O 3 and about 10 to about 30 mole percent of at least one metal oxide selected from the group consisting of V 2 O 5 , Nb 2 O 5 and Ta 2 O 5 .
References Cited (Backward Citations)
US4052691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |