C01C 3/02
Preparation, separation or purification of hydrogen cyanide
Official title: Preparation, {separation or purification} of hydrogen cyanide {(C01C3/001 takes precedence)}
C01C3/02 (Preparation, separation or purification of hydrogen cyanide) appears on 193 US grants and 124 published applications in this corpus.
Search patents in C01C- Granted patents
- 193
- Published applications
- 124
- Assignees
- 75
- Inventors
- 441
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 9 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 13 | 0 |
| 2001 | 9 | 4 |
| 2002 | 7 | 12 |
| 2003 | 10 | 6 |
| 2004 | 2 | 4 |
| 2005 | 4 | 3 |
| 2006 | 4 | 5 |
| 2007 | 3 | 3 |
| 2008 | 3 | 3 |
| 2009 | 2 | 2 |
| 2010 | 2 | 6 |
| 2011 | 0 | 11 |
| 2012 | 3 | 3 |
| 2013 | 5 | 2 |
| 2014 | 2 | 3 |
| 2015 | 4 | 10 |
| 2016 | 2 | 19 |
| 2017 | 3 | 5 |
| 2018 | 2 | 4 |
| 2019 | 3 | 2 |
| 2020 | 6 | 4 |
| 2021 | 4 | 3 |
| 2022 | 0 | 2 |
| 2023 | 1 | 1 |
| 2024 | 2 | 2 |
| 2025 | 2 | 2 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Gauzes having a tertiary structure for the catalytic conversion of fluids15 Sep 2026US 12,734,513 B2
- Method for producing hydrocyanic acid and device for producing hydrocyanic acid9 Jun 2026US 12,649,667 B1Mitsubishi Chemical Corporation
- Cyanide on demand11 Mar 2025US 12,246,970 B2Haldor TopsøE A/S
- Endothermic reactions heated by resistance heating4 Feb 2025US 12,214,327 B2Haldor TopsøE A/S
- Process for the purification of hydrogen cyanide26 Mar 2024US 11,939,281 B2Evonik Operations GmbH
- Process for recovering platinum-group metal from waste catalyst by using biocyanide and ionic liquid8 Oct 2026US 2026/0308713 A1Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
- Apparatus for the production of nitriles and use thereof17 Sep 2026US 2026/0273491 A1Evonik Operations GmbH
- Catalytically active heating elements, production and use thereof7 May 2026US 2026/0129720 A1Evonik Operations GmbH
- Catalyst network comprising a noble metal wire made of a dispersion-strengthened noble metal alloy23 Oct 2025US 2025/0325972 A1Heraeus Precious Metals GmbH & Co. KG
- Endothermic reactions heated by resistance heating17 Apr 2025US 2025/0121344 A1Haldor TopsøE A/S
Most cited
By later US patents
- Solid multi-component membranes, electrochemical reactor components, electrochemical reactors and use of membranes, reactor components, and reactor for oxidation reactions202US 5,306,411 AThe Standard Oil Company · 1994
- Two component-three dimensional catalysis105US 6,355,093 B1Eltron Research, Inc. · 2002
- Solid multi-component membranes, electrochemical reactor components, electrochemical reactors and use of membranes, reactor components, and reactor for oxidation reactions99US 5,744,015 A1998
- Ceramic membranes for catalytic membrane reactors with high ionic conductivities and low expansion properties91US 6,146,549 AEltron Research, Inc. · 2000
- Powders providing controlled sustained release of a gas64US 5,965,264 ABernard Technologies, Inc. · 1999