D21H 17/43
Carboxyl groups or derivatives thereof
D21H17/43 (Carboxyl groups or derivatives thereof) appears on 198 US grants and 72 published applications in this corpus.
Search patents in D21H- Granted patents
- 198
- Published applications
- 72
- Assignees
- 122
- Inventors
- 420
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 12 | 0 |
| 1979 | 7 | 0 |
| 1980 | 11 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 2 | 0 |
| 1986 | 6 | 0 |
| 1987 | 3 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 9 | 0 |
| 1992 | 5 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 9 | 0 |
| 1999 | 5 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 1 |
| 2002 | 8 | 7 |
| 2003 | 4 | 5 |
| 2004 | 4 | 4 |
| 2005 | 2 | 2 |
| 2006 | 3 | 4 |
| 2007 | 1 | 4 |
| 2008 | 0 | 2 |
| 2009 | 2 | 2 |
| 2010 | 2 | 4 |
| 2011 | 2 | 0 |
| 2012 | 2 | 2 |
| 2013 | 2 | 2 |
| 2014 | 2 | 1 |
| 2015 | 0 | 2 |
| 2016 | 2 | 2 |
| 2017 | 0 | 3 |
| 2018 | 4 | 2 |
| 2019 | 1 | 5 |
| 2020 | 5 | 1 |
| 2021 | 0 | 6 |
| 2022 | 4 | 2 |
| 2023 | 2 | 2 |
| 2024 | 1 | 3 |
| 2025 | 4 | 1 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Treatment system for manufacture of paper, board or the like21 Apr 2026US 12,606,959 B2Kemira Oyj
- Wet laid paper and paperboard products with high wet strength and method of making the same27 Jan 2026US 12,534,854 B2First Quality Tissue, LLC
- Synthetic method for the preparation of rheological modifying polymers and the use thereof21 Oct 2025US 12,448,477 B2Polyanalytik Inc.
- Polymer and method for the preparation thereof22 Jul 2025US 12,365,754 B2Snf Group
- Method for manufacturing paper and cardboard25 Feb 2025US 12,234,609 B2Snf Group
- Treatment system and method for manufacture of paper, board or the like27 Aug 2026US 2026/0250909 A1Kemira Oyj
- Composite materials and methods for preparing the same with latent acid catalysts25 Jun 2026US 2026/0176453 A1Neenah, Inc.
- Wet laid paper and paperboard products with high wet strength and method of making the same21 May 2026US 2026/0139438 A1First Quality Tissue, LLC
- Novel polymer and method for the preparation thereof29 May 2025US 2025/0171577 A1Snf Group
- Use of an anionic additive to improve dry strength composition performance8 Aug 2024US 2024/0263400 A1Ecolab USA Inc.
Most cited
By later US patents
- Water absorbing agent285US 4,734,478 ANippon Shokubai Kagaku Kogyo Co., Ltd. · 1988
- Water-disintegrable cleaning sheet156US 5,281,306 AKao Corporation · 1994
- Cellulose-Based medical packaging material sterilizable by oxidizing gas plasma127US 6,156,677 AKimberly-Clark Worldwide, Inc. · 2000
- Highly filled sheets and method of preparation thereof125US 4,225,383 AThe Dow Chemical Company · 1980
- Loaded paper116US 4,925,530 AThe Wiggins Teape Group Limited · 1990