C01B 21/0438
By making use of membranes
Official title: {by making use of membranes}
C01B21/0438 (By making use of membranes) appears on 68 US grants and 50 published applications in this corpus.
Search patents in C01B- Granted patents
- 68
- Published applications
- 50
- Assignees
- 52
- Inventors
- 161
- Latest grant
- 8 Aug 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 3 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 3 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 2 | 3 |
| 2012 | 1 | 0 |
| 2013 | 3 | 2 |
| 2014 | 1 | 1 |
| 2015 | 2 | 3 |
| 2016 | 2 | 3 |
| 2017 | 3 | 9 |
| 2018 | 5 | 3 |
| 2019 | 2 | 5 |
| 2020 | 2 | 1 |
| 2021 | 5 | 3 |
| 2022 | 2 | 0 |
| 2023 | 2 | 2 |
| 2024 | 0 | 0 |
| 2025 | 0 | 3 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hybrid nitrogen gas generation system8 Aug 2023US 11,717,785 B2Frito-Lay North America, Inc.
- Vacuum assisted air separation module operation18 Apr 2023US 11,628,393 B2Hamilton Sundstrand Corporation
- Air separation modules and methods of removing condensate from air separation modules8 Nov 2022US 11,491,442 B2Hamilton Sundstrand Corporation
- Graphene nanowindow structure and method for producing highly pure gas22 Mar 2022US 11,278,849 B2Kotobuki Holdings Co., Ltd.
- Vacuum assisted air separation module operation21 Sep 2021US 11,123,687 B2Hamilton Sundstrand Corporation
- Combined Inert Gas and Instrument Air System for Marine Applications30 Apr 2026US 2026/0115651 A1Air Products and Chemicals, Inc.
- Reducing Energy Consumption in Nitrogen Production Using a Turboexpander19 Jun 2025US 2025/0196057 A1Air Products and Chemicals, Inc.
- Apparatus and Method for Nitrogen Generation for Methanol Powered Maritime Vehicle19 Jun 2025US 2025/0197218 A1Air Products and Chemicals, Inc.
- Systems and methods for producing renewable ammonia20 Feb 2025US 2025/0059057 A1Remo Energy, Inc.
- Rotary Kiln Catalytically Enhanced Oxy-Fuel Gasification and Oxy-fuel Combustion (RK-GEN) System, Method, or Apparatus26 Oct 2023US 2023/0340344 A1
Most cited
By later US patents
- Process for separating components of a gas stream137US 4,701,187 AAir Products and Chemicals, Inc. · 1987
- Gas separations utilizing glassy polymer membranes at sub-ambient temperatures80US 5,837,032 AThe Cynara Company · 1998
- Nitrogen generation control systems and methods for controlling oxygen content in containers for perishable goods55US 5,649,995 ANitec, Inc. · 1997
- 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