C01B 21/1409
Preparation
Official title: {Preparation}
C01B21/1409 (Preparation) appears on 122 US grants and 37 published applications in this corpus.
Search patents in C01B- Granted patents
- 122
- Published applications
- 37
- Assignees
- 38
- Inventors
- 215
- Latest grant
- 18 Jul 2017
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 10 |
| 2005 | 3 | 3 |
| 2006 | 5 | 3 |
| 2007 | 3 | 5 |
| 2008 | 5 | 4 |
| 2009 | 4 | 4 |
| 2010 | 2 | 1 |
| 2011 | 1 | 2 |
| 2012 | 1 | 1 |
| 2013 | 1 | 2 |
| 2014 | 2 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- C01B 21/1418By catalytic reduction of nitrogen oxides or nitrates with hydrogen66
- C01B 21/1445Of hydoxylamine from its salts27
- C01B 21/1454Of hydroxylamine salts by processes not covered by one or more of22
- C01B 21/1427By reduction of nitrogen oxides or nitrites with bisulfite or sulfur dioxide3
- C01B 21/1436By reaction in the gas phase1
Recent patents
- Methods and systems for the reduction of molecules using diamond as a photoreduction catalyst18 Jul 2017US 9,708,716 B2Wisconsin Alumni Research Foundation
- Methods and systems for the reduction of molecules using diamond as a photoreduction catalyst24 Mar 2015US 8,986,532 B2Wisconsin Alumni Research Foundation
- Process for removing NO and N2O from gas mixtures25 Nov 2014US 8,894,960 B2BASF SE
- Process for working up an exhaust gas from a system for producing hydroxylamine or hydroxylammonium salts25 Mar 2014US 8,679,436 B2BASF SE
- Method for manufacturing hydroxylamine1 Oct 2013US 8,545,789 B2China Petrochemical Development Corporation
- Methods and systems for the reduction of molecules using diamond as a photoreduction catalyst22 Oct 2015US 2015/0299870 A1Wisconsin Alumni Research Foundation
- Methods and systems for the reduction of molecules using diamond as a photoreduction catalyst1 Aug 2013US 2013/0192977 A1Wisconsin Alumni Research Foundation
- Process for working up an exhaust gas from a system for producing hydroxylamine or hydroxylammonnium salts18 Jul 2013US 2013/0183222 A1BASF SE
- Destruction of ammonium ions24 May 2012US 2012/0128569 A1
- Method for manufacturing hydroxylamine14 Jul 2011US 2011/0171103 A1China Petrochemical Development Corporation
Most cited
By later US patents
- Process for preparing noble metal catalysts35US 4,052,336 AStamicarbon B. V. · 1977
- Gauze catalyst based on titanium or vanadium zeolites and inert gauze fabrics for accelerating oxidation reactions31US 6,106,797 ABASF SE · 2000
- Platinum-on-graphite catalysts and the use thereof24US 5,120,699 ABASF SE · 1992
- Synthesis of hydroxylamine salts20US 4,956,168 AThe United States of America as represented by the Secretary of the Navy · 1990
- Electrochemical conversion of nitrogen containing gas to hydroxylamine and hydroxylammonium salts19US 5,709,789 ASachem, Inc. · 1998