C01B 21/1463
Concentration
Official title: {Concentration}
C01B21/1463 (Concentration) appears on 8 US grants and 3 published applications in this corpus.
Search patents in C01B- Granted patents
- 8
- Published applications
- 3
- Assignees
- 6
- Inventors
- 25
- Latest grant
- 17 Feb 2009
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for producing hydroxylamine17 Feb 2009US 7,491,846 B2Showa Denko K. K.
- Preparation of a high purity and high concentration hydroxylamine free base8 Jul 2008US 7,396,519 B2San Fu Chemical Co., Ltd.
- Process for the preparation of hydroxylammonium15 Aug 2006US 7,090,817 B2Dsm IP Assets B.V.
- Process for separating medium boiling substances from a mixture of low, medium and high boiling substances3 Jul 2001US 6,254,735 B1BASF SE
- Method for producing highly pure aqueous hydroxylamine solutions28 Nov 2000US 6,153,799 ABASF SE
- Process for Producing Hydroxylamine14 Aug 2008US 2008/0193362 A1Showa Denko K. K.
- Preparation of a high purity and high concentration hydroxylamine free base28 Jul 2005US 2005/0163694 A1San Fu Chemical Co., Ltd.
- Process for the preparation of hydroxylammonium3 Mar 2005US 2005/0047987 A1Dsm IP Assets B.V.
Most cited
By later US patents
- Process for production of aqueous solutions of free hydroxylamine19US 5,837,107 ABASF SE · 1998
- Process for separating medium boiling substances from a mixture of low, medium and high boiling substances15US 6,254,735 B1BASF SE · 2001
- Process for concentrating aqueous solutions of hydroxylammonium salts10US 4,851,125 AOlin Corporation · 1989
- Process for producing hydroxylamine8US 7,491,846 B2Showa Denko K. K. · 2009
- Method for manufacturing hydroxylamine4US 5,762,897 AAlliedSignal Inc. · 1998