C01B 21/0837
Purification
Official title: {Purification}
C01B21/0837 (Purification) appears on 12 US grants and 13 published applications in this corpus.
Search patents in C01B- Granted patents
- 12
- Published applications
- 13
- Assignees
- 9
- Inventors
- 42
- Latest grant
- 8 Jul 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 2 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 2 | 1 |
| 2007 | 0 | 2 |
| 2008 | 1 | 2 |
| 2009 | 2 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Process for purifying perfluorinated products8 Jul 2014US 8,771,626 B2E. I. Du Pont de Nemours and Company
- Process for refining nitrogen trifluoride gas using alkali earth metal exchanged zeolite30 Nov 2010US 7,842,125 B2Hyosung Corporation
- Process for refining nitrogen trifluoride gas using alkali earth metal exchanged and impregnated zeolite29 Dec 2009US 7,637,986 B2Hyosung Corporation
- Method for purifying nitrogen trifluoride4 Aug 2009US 7,569,122 B2Sodiff Advanced Materials Co., Ltd.
- Purification of nitrogen trifluoride10 Jun 2008US 7,384,618 B2Honeywell International Inc.
- Method, device and system for enrichment of nf3 gas24 Mar 2016US 2016/0083254 A1Oci Company Ltd.
- Method and Apparatus for Removing Contaminants from Nitrogen Trifluoride26 Dec 2013US 2013/0341178 A1Air Products and Chemicals, Inc.
- Method For Purifying Nitrogen Trifluoride4 Jun 2009US 2009/0142248 A1Sodiff Advanced Materials Co., Ltd.
- Process For Refining Nitrogen Trifluoride Gas Using Alkali Earth Metal Exchanged And Impregnated Zeolite17 Apr 2008US 2008/0087166 A1Hyosung Corporation
- Process for refining nitrogen trifluoride gas using alkali earth metal exchanged zeolite24 Jan 2008US 2008/0019894 A1Hyosung Corporation
Most cited
By later US patents
- Method for purifying nitrogen trifluoride gas89US 4,933,158 AMitsui Toatsu Chemicals, Inc. · 1990
- Method of refining nitrogen trifluoride gas18US 5,069,887 ACentral Glass Company, Limited · 1991
- Method of liquefying and condensing nitrogen trifluoride and a method of purifying nitrogen trifluoride16US 4,975,259 AMitsui Toatsu Chemicals, Inc. · 1990
- Process for kinetic gas-solid chromatographic separations11US 5,069,690 AAir Products and Chemicals, Inc. · 1991
- Purification of nitrogen trifluoride7US 7,384,618 B2Honeywell International Inc. · 2008