C01C 1/22
Sulfites of ammonium
C01C1/22 (Sulfites of ammonium) appears on 22 US grants and 14 published applications in this corpus.
Search patents in C01C- Granted patents
- 22
- Published applications
- 14
- Assignees
- 16
- Inventors
- 42
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 2 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 0 | 1 |
| 2025 | 3 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for controlling hydrogen sulfide and ammonia flow rates2 Dec 2025US 12,485,384 B2Uop LLC
- Method and treatment facility for physical and thermochemical treatment of biomass2 Dec 2025US 12,486,460 B2Next Generation Elements GmbH
- Nutrient recovery systems and methods28 Jan 2025US 12,209,026 B2Andgar Corporation
- Removal of urea and ammonia from exhaust gases5 May 2020US 10,640,428 B2Stamicarbon B. V.
- Nutrient recovery systems and methods11 Feb 2020US 10,556,804 B2Andgar Corporation
- Process for controlling hydrogen sulfide and ammonia flow rates1 Jan 2026US 2026/0001033 A1Uop LLC
- Process for stabilizing nutrients in a discharged anaerobic digestate10 Jul 2025US 2025/0222400 A1ThioSolv, LLC
- Nutrient recovery systems and methods29 May 2025US 2025/0171324 A1
- Process for producing an ammonium sulfite and bisulfite solution from ammonia gas18 Apr 2024US 2024/0124318 A1ThioSolv, LLC
- Method and treatment facility for physical and thermochemical treatment of biomass21 Sep 2023US 2023/0295516 A1Next Generation Elements GmbH
Most cited
By later US patents
- Nutrient recovery systems and methods13US 8,613,894 B2Andgar Corporation · 2013
- Process for removing contaminants from hot waste gas streams9US 3,957,951 AInternational Telephone and Telegraph Corporation · 1976
- Removal of contaminants and recovery of by-products from hot waste gas stream9US 4,248,842 AInternational Telephone and Telegraph Corporation · 1981
- Apparatus for converting noxious pollutants from flue gas into merchantable by-products9US 5,344,617 A1994
- Ammonia double-alkali process for removing sulfur oxides from stack gases8US 4,231,995 ASmelter Control Research Association, Inc. · 1980