A01C 23/001
Sludge spreaders
Official title: {Sludge spreaders, e.g. liquid manure spreaders}
A01C23/001 (Sludge spreaders) appears on 92 US grants and 82 published applications in this corpus.
Search patents in A01C- Granted patents
- 92
- Published applications
- 82
- Assignees
- 61
- Inventors
- 150
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 5 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 1 | 1 |
| 2009 | 3 | 1 |
| 2010 | 4 | 2 |
| 2011 | 1 | 6 |
| 2012 | 3 | 3 |
| 2013 | 1 | 2 |
| 2014 | 0 | 2 |
| 2015 | 4 | 2 |
| 2016 | 4 | 4 |
| 2017 | 2 | 1 |
| 2018 | 3 | 8 |
| 2019 | 3 | 4 |
| 2020 | 5 | 7 |
| 2021 | 7 | 5 |
| 2022 | 3 | 6 |
| 2023 | 6 | 5 |
| 2024 | 1 | 6 |
| 2025 | 1 | 5 |
| 2026 | 7 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Apparatus for injecting manure into the ground11 Aug 2026US 12,702,082 B2
- Systems, methods and apparatuses for liquid manure spreading14 Jul 2026US 12,677,731 B2
- Liquid manure pump with angled gearbox23 Jun 2026US 12,660,737 B2
- Pump for immersion within a fluid reservoir5 May 2026US 12,618,412 B2Nuhn Industries Ltd.
- Macerator24 Mar 2026US 12,582,995 B2Mastek Limited
- Manure Applicator System3 Sep 2026US 2026/0256052 A1WiSys Technology Foundation, Inc.
- Pump for immersion within a fluid reservoir23 Jul 2026US 2026/0210366 A1Nuhn Industries Ltd.
- A macerator19 Mar 2026US 2026/0076293 A1
- Pipe bridge for liquid transport30 Oct 2025US 2025/0334205 A1
- Compact manure incorporation system21 Aug 2025US 2025/0261582 A1
Most cited
By later US patents
- Pump for soil fumigant89US 4,141,676 AJohn Blue Company Division of Subscription Television, Inc. · 1979
- Liquid fertilizer distributor34US 4,284,243 A1981
- Fertilizer distribution head and dispensing chute29US 5,271,567 AAg-Chem Equipment Co., Inc. · 1993
- Slurry mixer and spreader25US 4,082,227 ABio-Life Company, Inc. · 1978
- Apparatus and method for the injection of viscous fertilizer below the surface of the soil16US 7,775,168 B2American Water Works Company, Inc. · 2010