C01B 3/501
By diffusion
Official title: by diffusion
C01B3/501 (By diffusion) appears on 1,000 US grants and 1,136 published applications in this corpus.
Search patents in C01B- Granted patents
- 1,000
- Published applications
- 1,136
- Assignees
- 564
- Inventors
- 2,393
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 11 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 7 | 0 |
| 1993 | 7 | 0 |
| 1994 | 8 | 0 |
| 1995 | 9 | 0 |
| 1996 | 7 | 0 |
| 1997 | 10 | 0 |
| 1998 | 12 | 0 |
| 1999 | 20 | 0 |
| 2000 | 14 | 0 |
| 2001 | 35 | 10 |
| 2002 | 25 | 28 |
| 2003 | 37 | 54 |
| 2004 | 26 | 65 |
| 2005 | 29 | 53 |
| 2006 | 36 | 65 |
| 2007 | 36 | 73 |
| 2008 | 31 | 51 |
| 2009 | 34 | 62 |
| 2010 | 45 | 63 |
| 2011 | 53 | 63 |
| 2012 | 41 | 49 |
| 2013 | 43 | 46 |
| 2014 | 53 | 39 |
| 2015 | 47 | 44 |
| 2016 | 33 | 34 |
| 2017 | 25 | 26 |
| 2018 | 37 | 20 |
| 2019 | 18 | 27 |
| 2020 | 18 | 19 |
| 2021 | 20 | 24 |
| 2022 | 19 | 43 |
| 2023 | 25 | 35 |
| 2024 | 21 | 48 |
| 2025 | 31 | 60 |
| 2026 | 20 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Purge gas conditioning of NH3 plants15 Sep 2026US 12,735,325 B2Stamicarbon B. V.
- Gas separation membrane, and preparation method therefor and use thereof25 Aug 2026US 12,714,972 B2Changshu 3F Zhonghao New Chemical Materials Co., Ltd.
- Palladium-based membrane25 Aug 2026US 12,715,767 B2National University of Singapore
- Green methanol production25 Aug 2026US 12,715,827 B2ZoneFlow Reactor Technologies, LLC
- Adiabatic multi-stage reactors for hydrogen production and related systems and methods4 Aug 2026US 12,698,204 B2Saudi Arabian Oil Company
- Steam-Hydrocarbon Reforming with Reduced Carbon Dioxide Emissions8 Oct 2026US 2026/0307987 A1Air Products and Chemicals, Inc.
- Methanol Production System that Reuses Unreacted Gas for Efficient Methanol Production10 Sep 2026US 2026/0264037 A1Doosan Enerbility Co., Ltd.
- Method for producing low-carbon hydrogen and plant for the implementation thereof10 Sep 2026US 2026/0265051 A1Publichnoe Aktsionernoe Obshchestvo "NOVATEK"
- Pressure swing adsorption facility27 Aug 2026US 2026/0249231 A1Institute for Advanced Engineering
- Plant and process for producing hydrogen from hydrocarbons20 Aug 2026US 2026/0242219 A1Technip Energies France
Most cited
By later US patents
- Steam reformer with internal hydrogen purification533US 5,861,137 A1999
- Method for simultaneous recovery of hydrogen from water and from hydrocarbons351US 5,525,322 AThe Regents of the University of California · 1996
- Hydrogen gas-extraction module and method of fabrication341US 6,152,987 AWorcester Polytechnic Institute · 2000
- Catalytic ceramic membrane steam-hydrocarbon reformer269US 5,229,102 AMedalert Corporation · 1993
- Steam reformer with internal hydrogen purification269US 5,997,594 ANorthwest Power Systems, LLC · 1999