D21H 17/375
Polyacrylamide
Official title: {Poly(meth)acrylamide}
D21H17/375 (Polyacrylamide) appears on 505 US grants and 487 published applications in this corpus.
Search patents in D21H- Granted patents
- 505
- Published applications
- 487
- Assignees
- 197
- Inventors
- 1,017
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 6 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 16 | 0 |
| 1997 | 12 | 0 |
| 1998 | 12 | 0 |
| 1999 | 15 | 0 |
| 2000 | 19 | 0 |
| 2001 | 10 | 2 |
| 2002 | 10 | 15 |
| 2003 | 6 | 13 |
| 2004 | 11 | 7 |
| 2005 | 2 | 18 |
| 2006 | 3 | 24 |
| 2007 | 6 | 6 |
| 2008 | 1 | 16 |
| 2009 | 8 | 17 |
| 2010 | 13 | 22 |
| 2011 | 20 | 13 |
| 2012 | 19 | 17 |
| 2013 | 10 | 15 |
| 2014 | 26 | 21 |
| 2015 | 15 | 31 |
| 2016 | 14 | 25 |
| 2017 | 27 | 39 |
| 2018 | 24 | 21 |
| 2019 | 22 | 20 |
| 2020 | 23 | 22 |
| 2021 | 23 | 28 |
| 2022 | 16 | 10 |
| 2023 | 17 | 28 |
| 2024 | 12 | 35 |
| 2025 | 10 | 10 |
| 2026 | 13 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of preparing aldehyde-functionalized polymers29 Sep 2026US 12,747,307 B2Ecolab USA Inc.
- Water resistant and repulpable compositions28 Jul 2026US 12,692,662 B2Neenah, Inc.
- Stable cationic polyacrylamide dispersions and use thereof in papermaking2 Jun 2026US 12,644,230 B2Kemira Oyj
- Additive compositions for papermaking5 May 2026US 12,618,197 B2Solenis Technologies, L.P.
- Aqueous dispersion for improving barrier properties28 Apr 2026US 12,612,735 B2Actega DS GmbH
- Method for making a multi-layered board10 Sep 2026US 2026/0265999 A1Kemira Oyj
- Treatment system and method for manufacture of paper, board or the like27 Aug 2026US 2026/0250909 A1Kemira Oyj
- Strength composition and method for dissolving the strength composition23 Jul 2026US 2026/0210056 A1Kemira Oyj
- Stretchable paper23 Jul 2026US 2026/0210057 A1Billerud Aktiebolag (publ)
- Production of hydrophobic paper9 Jul 2026US 2026/0193844 A1Sca Forest Products AB
Most cited
By later US patents
- Soft absorbent tissue paper with high permanent wet strength192US 5,223,096 AThe Procter & Gamble Company · 1993
- Temporary wet strength resin165US 4,605,702 AAmerican Cyanamid Company · 1986
- Multi-elevational tissue paper containing selectively disposed chemical papermaking additive159US 5,840,403 AThe Procter & Gamble Company · 1998
- Multiply tissue paper156US 6,420,013 B1The Procter & Gamble Company · 2002
- Process for production of paper or board123US 9,605,382 B2Kemira Oyj · 2017