B01D 2251/504
Nitric acid
B01D2251/504 (Nitric acid) appears on 29 US grants and 37 published applications in this corpus.
Search patents in B01D- Granted patents
- 29
- Published applications
- 37
- Assignees
- 34
- Inventors
- 113
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 3 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 6 |
| 2020 | 6 | 3 |
| 2021 | 3 | 2 |
| 2022 | 2 | 3 |
| 2023 | 2 | 2 |
| 2024 | 4 | 1 |
| 2025 | 1 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Exhaust gas scrubber with energy integration14 Apr 2026US 12,599,871 B2thyssenkrupp AG
- Systems and processes for producing fixed-nitrogen compounds7 Jan 2025US 12,186,728 B2Nitricity Inc.
- System and method for liquid hydrocarbon desulfurization23 Jul 2024US 12,042,748 B2Alternative Environmental Technologies Sulfex Corp.
- System for removing ammonia, dust and pathogens from air within an animal rearing/sheltering facility21 May 2024US 11,986,768 B2The United States of America as represented by the Secretary of Agriculture
- Ammonia removal from urea finishing27 Feb 2024US 11,912,649 B2Stamicarbon B. V.
- Complete conversion of sulfur dioxide to sulfuric acid by aqueous acid absorption19 Mar 2026US 2026/0077296 A1Saudi Arabian Oil Company
- Contaminated air treatment29 Jan 2026US 2026/0027519 A1I/O Electrical & Mechanical Limited
- Ammonium nitrate production18 Dec 2025US 2025/0381545 A1Katholieke Universiteit Leuven
- Process for treating a nox containing gas1 May 2025US 2025/0135398 A1Casale SA
- Versatile scrubbing liquid for removal of contaminants from a gaseous stream6 Feb 2025US 2025/0041798 A1
Most cited
By later US patents
- Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide23US 7,258,848 B1E. I. Du Pont de Nemours and Company · 2007
- Metallurgical dust recycle process7US 5,912,402 ADrinkard Metalox, Inc. · 1999
- Method and plant for amine emission control7US 9,155,990 B2Aker Clean Carbon AS · 2015
- Urea ammonium nitrate production comprising condensation5US 10,370,326 B2Stamicarbon B. V. · 2019
- Nitric acid production and recycle5US 6,264,909 B1Drinkard Metalox, Inc. · 2001