Y02A 40/20
Fertilizers of biological origin
Official title: Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Y02A40/20 (Fertilizers of biological origin) appears on 1,273 US grants and 1,274 published applications in this corpus.
Search patents in Y02A- Granted patents
- 1,273
- Published applications
- 1,274
- Assignees
- 919
- Inventors
- 2,613
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 14 | 0 |
| 1978 | 15 | 0 |
| 1979 | 20 | 0 |
| 1980 | 25 | 0 |
| 1981 | 18 | 0 |
| 1982 | 16 | 0 |
| 1983 | 8 | 0 |
| 1984 | 6 | 0 |
| 1985 | 14 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 16 | 0 |
| 1992 | 11 | 0 |
| 1993 | 21 | 0 |
| 1994 | 23 | 0 |
| 1995 | 31 | 0 |
| 1996 | 23 | 0 |
| 1997 | 32 | 0 |
| 1998 | 27 | 0 |
| 1999 | 24 | 0 |
| 2000 | 24 | 0 |
| 2001 | 29 | 6 |
| 2002 | 48 | 37 |
| 2003 | 33 | 46 |
| 2004 | 28 | 53 |
| 2005 | 18 | 40 |
| 2006 | 26 | 44 |
| 2007 | 19 | 40 |
| 2008 | 14 | 43 |
| 2009 | 20 | 45 |
| 2010 | 25 | 50 |
| 2011 | 29 | 43 |
| 2012 | 28 | 52 |
| 2013 | 43 | 46 |
| 2014 | 29 | 71 |
| 2015 | 43 | 74 |
| 2016 | 41 | 76 |
| 2017 | 40 | 71 |
| 2018 | 40 | 67 |
| 2019 | 56 | 79 |
| 2020 | 61 | 63 |
| 2021 | 42 | 66 |
| 2022 | 30 | 51 |
| 2023 | 44 | 55 |
| 2024 | 37 | 29 |
| 2025 | 28 | 24 |
| 2026 | 7 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Freeze concentration for urine-based fertilizer production29 Sep 2026US 12,747,194 B2The Regents of the University of Michigan
- Method for treating human or animal urine and uses of the transformed urine obtained in particular as fertiliser26 May 2026US 12,637,372 B2Toopi Organics
- Processes and systems for producing ammonia products and/or calcium carbonate products12 May 2026US 12,623,978 B2M.A.R.G., LLC
- Organic waste processing device and method21 Apr 2026US 12,605,716 B2Bigz Tech Inc.
- Eco-friendly water retention natural polymer and method thereof3 Mar 2026US 12,564,827 B2EF Polymer K.K.
- Compositions and Methods for Coating of Nitrification Inhibitors with a Solution Containing a High Concentration of Urease Inhibitors and For Improved Retention of the Nitrogen Content of Soil Through the Administration of Liquid Delivery Formulations of (Aminomethylene)Phosphinic Acids and/or their Salts1 Oct 2026US 2026/0296987 A1Soilgenic Technologies, LLC
- Compositions for increasing nitrogen sources life span in plant growth mediums and methods of making7 May 2026US 2026/0125331 A1Soilgenic Technologies, LLC
- Intelligent, efficient and high-value manure treatment system based on ecological livestock and poultry farming and method therefor23 Apr 2026US 2026/0109636 A1Hunan Normal University
- Double Drum Systems and Processes for Converting Biosolids to Fertilizer6 Nov 2025US 2025/0340494 A1
- Efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials6 Nov 2025US 2025/0341054 A1Pierson Capital Environmental (Beijing) Limited
Most cited
By later US patents
- Biochar157US 8,361,186 B1Full Circle Biochar, Inc. · 2013
- Method of treating wastewater sludge98US 4,781,842 AN-Viro Energy Systems Ltd. · 1988
- Method for treating wastewater sludge94US 4,902,431 AN-Viro Energy Systems Ltd. · 1990
- Fertilizer and method93US 4,743,287 A1988
- Process to stabilize bioorganic, raw or treated wastewater sludge89US 5,417,861 AN-Viro International Corporation · 1995