C01B 21/1427
By reduction of nitrogen oxides or nitrites with bisulfite or sulfur dioxide
Official title: {by reduction of nitrogen oxides or nitrites with bisulfite or sulfur dioxide, e.g. by the Raschig process}
C01B21/1427 (By reduction of nitrogen oxides or nitrites with bisulfite or sulfur dioxide) appears on 3 US grants and 0 published applications in this corpus.
Search patents in C01B- Granted patents
- 3
- Published applications
- 0
- Assignees
- 2
- Inventors
- 6
- Latest grant
- 14 May 1991
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
By publication year. Applications have been published since 2001.
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