Title: Humidity sensitive ceramic resistor

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Claims: What is claimed is:

1. 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.sub.2 O.sub.4, FeCr.sub.2 O.sub.4, NiCr.sub.2 O.sub.4, CoCr.sub.2 O.sub.4, MnCr.sub.2 O.sub.4, CuCr.sub.2 O.sub.4 and, Mg.sub.2 TiO.sub.4, Mg.sub.2 SnO.sub.4.

2. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of MgCr.sub.2 O.sub.4.

3. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of FeCr.sub.2 O.sub.4.

4. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of NiCr.sub.2 O.sub.4.

5. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of CoCr.sub.2 O.sub.4.

6. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of MnCr.sub.2 O.sub.4.

7. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of CuCr.sub.2 O.sub.4.

8. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of Mg.sub.2 TiO.sub.4.

9. A humidity sensitive ceramic resistor according to claim 1, wherein said main component consists essentially of Mg.sub.2 SnO.sub.4.

10. 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.sub.2 O.sub.4, FeCr.sub.2 O.sub.4, NiCr.sub.2 O.sub.4, CoCr.sub.2 O.sub.4, MnCr.sub.2 O.sub.4, CuCr.sub.2 O.sub.4, Mg.sub.2 TiO.sub.4, Mg.sub.2 SnO.sub.4 and 99 to 1 mole percent of TiO.sub.2.

11. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of MgCr.sub.2 O.sub.4.

12. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of FeCr.sub.2 O.sub.4.

13. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of NiCr.sub.2 O.sub.4.

14. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of CoCr.sub.2 O.sub.4.

15. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of MnCr.sub.2 O.sub.4.

16. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of CuCr.sub.2 O.sub.4.

17. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of Mg.sub.2 TiO.sub.4.

18. A humidity sensitive ceramic resistor according to claim 10, wherein said component consists essentially of Mg.sub.2 SnO.sub.4.

19. 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.sub.2 O.sub.4, FeCr.sub.2 O.sub.4, NiCr.sub.2 O.sub.4, CoCr.sub.2 O.sub.4, MnCr.sub.2 O.sub.4, CuCr.sub.2 O.sub.4, Mg.sub.2 TiO.sub.4, Mg.sub.2 SnO.sub.4, and 1 to 40 mole percent of at least one additional metal oxide selected from the group consisting of SnO.sub.2, ZrO.sub.2 and HfO.sub.2.

20. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of MgCr.sub.2 O.sub.4.

21. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of FeCr.sub.2 O.sub.4.

22. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of NiCr.sub.2 O.sub.4.

23. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of CoCr.sub.2 O.sub.4.

24. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of MnCr.sub.2 O.sub.4.

25. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of CuCr.sub.2 O.sub.4.

26. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of Mg.sub.2 TiO.sub.4.

27. A humidity sensitive ceramic resistor according to claim 19, wherein said main component consists essentially of Mg.sub.2 SnO.sub.4.

28. A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of SnO.sub.2.

29. A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of ZrO.sub.2.

30. A humidity sensitive ceramic resistor according to claim 19, wherein said additional metal oxide consists essentially of HfO.sub.2.

Other info:

Inventors: Nitta, Tsuneharu (Katano, JA)
Terada, Ziro (Yao, JA)
Hayakawa, Shigeru (Hirakata, JA)

Application Number: 720078
Filing Date: 1976-09-02
Publication_date: 1978-04-25
Assignee: Matsushita Electric Industrial Co., Ltd. (JA)
Primary Class(es): 338/35 252/518.1, 252/520.1, 252/520.2, 252/521.2, 338/34
Other Classes:
US Patent Ref:

3766098	Oct, 1973	Masuyama et al.	252/519.
3926858	Dec, 1975	Ichinose et al.	252/519.

Other Refs:
Primary Examiner: Padgett, Benjamin R.
Assistant Examiner: Barr, Josephine L.
Attorney: Wenderoth, Lind & Ponack