C01B 21/0444
Characterised by the membrane
Official title: {characterised by the membrane}
C01B21/0444 (Characterised by the membrane) appears on 29 US grants and 19 published applications in this corpus.
Search patents in C01B- Granted patents
- 29
- Published applications
- 19
- Assignees
- 28
- Inventors
- 76
- Latest grant
- 22 Mar 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 2 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 3 |
| 2017 | 2 | 7 |
| 2018 | 4 | 1 |
| 2019 | 1 | 2 |
| 2020 | 0 | 0 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Graphene nanowindow structure and method for producing highly pure gas22 Mar 2022US 11,278,849 B2Kotobuki Holdings Co., Ltd.
- System and method used to recycle exhaust gas during olefin polymer production18 May 2021US 11,007,474 B2Hangzhou Ouyuan Technology Co., Ltd
- Refrigerating and freezing device12 Jan 2021US 10,890,369 B2Qingdao Haier Joint Stock Co., Ltd.
- Separation membrane structure19 Nov 2019US 10,478,783 B2NGK Insulators, Ltd.
- Ultra-thin, pinhole-free, flexible metal-organic films18 Dec 2018US 10,155,843 B2Luxembourg Institute of Science and Technology
- Reducing Energy Consumption in Nitrogen Production Using a Turboexpander19 Jun 2025US 2025/0196057 A1Air Products and Chemicals, Inc.
- Graphene nanowindow structure and method for producing highly pure gas4 Mar 2021US 2021/0060499 A1Kotobuki Tsushou Co., Ltd.
- System and method used to recycle exhaust gas during olefin polymer production19 Sep 2019US 2019/0282955 A1Hangzhou Ouyuan Technology Co., Ltd
- Refrigerating and freezing device16 May 2019US 2019/0145691 A1Qingdao Haier Joint Stock Co., Ltd.
- Membrane-based system for generating high-purity nitrogen20 Dec 2018US 2018/0361311 A1Generon IGS, Inc.
Most cited
By later US patents
- Gas separations utilizing glassy polymer membranes at sub-ambient temperatures80US 5,837,032 AThe Cynara Company · 1998
- Method and apparatus for producing oxygen and nitrogen and membrane therefor49US 4,542,010 ABend Research, Inc. · 1985
- Process for capturing nitrogen from air using gas separation membranes49US 4,894,068 APermea, Inc. · 1990
- In-situ crystallized zeolite containing composition (LAI-ISC)46US 5,895,769 AExxon Research & Engineering Co. · 1999
- Gas separations utilizing glassy polymer membranes at sub-ambient temperatures42US 5,352,272 AThe Dow Chemical Company · 1994