C07C 211/51
Phenylenediamines
C07C211/51 (Phenylenediamines) appears on 69 US grants and 55 published applications in this corpus.
Search patents in C07C- Granted patents
- 69
- Published applications
- 55
- Assignees
- 56
- Inventors
- 201
- Latest grant
- 1 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 4 | 3 |
| 2003 | 1 | 4 |
| 2004 | 5 | 1 |
| 2005 | 3 | 0 |
| 2006 | 0 | 4 |
| 2007 | 1 | 3 |
| 2008 | 4 | 3 |
| 2009 | 1 | 3 |
| 2010 | 1 | 1 |
| 2011 | 2 | 2 |
| 2012 | 1 | 1 |
| 2013 | 2 | 1 |
| 2014 | 1 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 7 |
| 2018 | 4 | 2 |
| 2019 | 5 | 4 |
| 2020 | 3 | 1 |
| 2021 | 3 | 0 |
| 2022 | 1 | 0 |
| 2023 | 2 | 4 |
| 2024 | 0 | 2 |
| 2025 | 1 | 4 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Antifoulant compositions for high-severity processing of vinylic monomer streams1 Jul 2025US 12,344,581 B2Ecolab USA Inc.
- Para-phenylenediamine derivative, 1,4-cyclohexyldiamine derivative, and fabricating method for 1,4-diamine cyclic compound derivative26 Dec 2023US 11,851,387 B2Yuanhan Materials Inc.
- Thermosetting polyimides derived from resveratrol6 Jun 2023US 11,667,737 B1The United States of America as represented by the Secretary of the Navy
- One-pot synthesis of hydrogen-bonded organic frameworks18 Oct 2022US 11,472,779 B1King Fahd University of Petroleum and Minerals
- Thermosetting polyimides derived from resveratrol7 Dec 2021US 11,192,967 B1The United States of America as represented by the Secretary of the Navy
- Fatigue- and aging-resistant rubber composition and use thereof21 May 2026US 2026/0139122 A1Sennics Co., Ltd.
- Methods and compositions for inhibition of tyrosine and phenylalanine-mediated dna damage and repair22 Jan 2026US 2026/0021068 A1Functional Longevity Labs
- Antifoulant compositions for high-severity processing of vinylic monomer streams11 Sep 2025US 2025/0282698 A1Ecolab USA Inc.
- Metal extractant and separation recovery method of metal ions using metal extractant31 Jul 2025US 2025/0243560 A1FUJIFILM Corporation
- Partially deuterated 1,4-phenylenediamine-d4 and preparation method and use thereof6 Mar 2025US 2025/0074863 A1Beijing Inst of Tech Deuterium Material Co., Ltd.
Most cited
By later US patents
- Fullerene derivatives32US 6,380,434 B12002
- Secondary diamines12US 5,041,668 AEthyl Corporation · 1991
- Substituted 2-aminoalky-1,4-diaminobenzene compounds and oxidation dye precursor compositions containing same12US 6,436,152 B1Wella Aktiengesellschaft · 2002
- Oxidizing hair coloring agents containing 2,5-diamino-1-phenylbenzene derivatives and novel 2,5-diamino-1-phenylbenzene derivatives11US 6,500,213 B1Wella Aktiengesellschaft · 2002
- N-N'-dihydrocarbyl substituted phenylene diamine-derived condensation products as antioxidants and lubricant compositions10US 4,966,721 AMobil Oil Corporation · 1990