Combustible gas sensor
Abstract
Abstract A combustible gas detecting element, the sensitive element of which has at least one material selected from the group consisting of gamma-type ferric oxide ( gamma -Fe2O3) and alpha-type ferric oxide ( alpha -Fe2O3) and has a microstructure with an average grain size smaller than 0.5 micrometers and a porosity of from 35 to 85%. The sensitivity is increased by adding at least one material selected from a group consisting of tin (Sn) and zinc (Zn) in a ratio from 0.5 to 70 mol %, based on stannic oxide (SnO) and zinc oxide (ZnO) relative to the ferric oxide component. The element is manufactured from fine particles obtained by coprecipitating metallic ions from a solution containing Fe ions and at least one member selected from the group consisting of Sn ions and Zn ions, and the fine particles are pressed and then sintered or are formed into a paste, printed on a substrate and then sintered.
Inventors
- 👤 Yoshihiko Nakatani
- 👤 Masayuki Sakai
- 👤 Seiichi Nakatani
- 👤 Michio Matsuoka
Bibliographic Details
Claims Analysis
Total Claims: 7References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |