A01N 43/20
Three- or four-membered rings
Official title: three- or four-membered rings
A01N43/20 (Three- or four-membered rings) appears on 204 US grants and 184 published applications in this corpus.
Search patents in A01N- Granted patents
- 204
- Published applications
- 184
- Assignees
- 124
- Inventors
- 690
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 6 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 7 | 0 |
| 1991 | 12 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 4 |
| 2003 | 2 | 3 |
| 2004 | 0 | 4 |
| 2005 | 2 | 2 |
| 2006 | 1 | 1 |
| 2007 | 2 | 4 |
| 2008 | 0 | 2 |
| 2009 | 1 | 2 |
| 2010 | 1 | 4 |
| 2011 | 1 | 5 |
| 2012 | 2 | 3 |
| 2013 | 2 | 5 |
| 2014 | 5 | 21 |
| 2015 | 10 | 15 |
| 2016 | 16 | 22 |
| 2017 | 18 | 24 |
| 2018 | 7 | 7 |
| 2019 | 6 | 4 |
| 2020 | 3 | 9 |
| 2021 | 9 | 6 |
| 2022 | 3 | 6 |
| 2023 | 3 | 13 |
| 2024 | 1 | 6 |
| 2025 | 5 | 7 |
| 2026 | 4 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Herbicidal malonamides28 Apr 2026US 12,612,394 B2BASF SE
- Epoxidized oil-based surfactant and compositions comprising the same31 Mar 2026US 12,588,676 B2Nouryon Chemicals International B. V.
- Biofilm disruption6 Jan 2026US 12,514,843 B2Qbiotics Pty Ltd
- 4-membered ring carboxamides used as nematicides6 Jan 2026US RE50,724 E1Syngenta Crop Protection AG
- Method for controlling herbicide resistant or tolerant weeds24 Jun 2025US 12,336,536 B2BASF Agro B.V.
- Arthropod control compositions13 Aug 2026US 2026/0231939 A1Firmenich SA
- Biofilm disruption9 Apr 2026US 2026/0097011 A1Qbiotics Pty Ltd
- Thiolactone-Derived Compounds for Generating Nitric Oxide and Methods of Forming the Same26 Mar 2026US 2026/0083127 A1Sterile State, LLC
- Herbicidal malonic acid monoamides and malonamide esters1 Jan 2026US 2026/0000075 A1BASF SE
- Method and composition of synergistic herbicidal mixtures23 Oct 2025US 2025/0324976 A1
Most cited
By later US patents
- Insecticidal N'-substituted-N,N'-diacylhydrazines83US 4,985,461 ARohm and Haas Company · 1991
- Insecticidal N' substituted-N-N'-disubstituted-hydrazines67US 5,117,057 ARohm and Haas Company · 1992
- Anthelmintic N'-substituted-N,N'-disubstitutedhydrazines56US 5,424,333 ARohm and Haas Company · 1995
- Heterocyclic phenyl ethers and herbicides containing same47US 4,130,413 AHoechst Aktiengesellschaft · 1978
- Substituted cycloalkyl- and heterocyclyl-carboxanilides45US 5,059,623 ABayer Aktiengesellschaft · 1991