C01B 25/04
Purification of phosphorus
C01B25/04 (Purification of phosphorus) appears on 30 US grants and 18 published applications in this corpus.
Search patents in C01B- Granted patents
- 30
- Published applications
- 18
- Assignees
- 20
- Inventors
- 95
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 2 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 2 |
| 2017 | 2 | 2 |
| 2018 | 2 | 1 |
| 2019 | 1 | 3 |
| 2020 | 2 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 1 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for purifying yellow phosphorus and method for producing high-purity phosphoric acid10 Feb 2026US 12,545,581 B2Rin Kagaku Kogyo Co., Ltd.
- Method for the purification of yellow phosphor5 Jan 2021US 10,882,746 B2LANXESS Deutschland GmbH
- Extraction of amino acids and phosphorus from biological materials28 Jul 2020US 10,723,663 B2The United States of America as represented by the Secretary of Agriculture
- Extraction of amino acids and phosphorus from biological materials14 Jul 2020US 10,710,937 B2The United States of America as represented by the Secretary of Agriculture
- Method, apparatus and special phosphorus recovery device for recovering yellow phosphorus from electric furnace phosphorus-producing furnace gas2 Apr 2019US 10,246,331 B2Intermet Technologies Chengdu Co., Ltd.
- Purification apparatus and purification method for non-metal semiconductor material11 Jul 2024US 2024/0228286 A1
- Method for producing by-product yellow phosphorus slag from yellow phosphorus by unconventional electric furnace process, and use22 Feb 2024US 2024/0059566 A1Zhengzhou University
- System for combined production of yellow phosphorus and syngas5 Jan 2023US 2023/0002692 A1Kunming University of Science and Technology
- Method for purifying yellow phosphorus and method for producing high-purity phosphoric acid24 Nov 2022US 2022/0371892 A1Rin Kagaku Kogyo Co., Ltd.
- A method for processing biomass digestate6 Jan 2022US 2022/0002760 A1NGF Nature Energy Biogas A/S
Most cited
By later US patents
- Films of catenated phosphorus materials, their preparation and use, and semiconductor and other devices employing them16US 5,032,472 AStauffer Chemical Company · 1991
- Catenated phosphorus materials, their preparation and use, and semiconductor and other devices employing them9US 4,508,931 AStauffer Chemical Company · 1985
- Apparatus for distilling phosphorus7US 4,575,403 AFMC Corporation · 1986
- Vacuum evaporating films of alkali metal polyphosphide5US 4,596,721 AStauffer Chemical Company · 1986
- Decolorization of elemental yellow phosphorus4US 4,299,806 AStauffer Chemical Company · 1981