D21H 21/10
Retention agents or drainage improvers
D21H21/10 (Retention agents or drainage improvers) appears on 554 US grants and 467 published applications in this corpus.
Search patents in D21H- Granted patents
- 554
- Published applications
- 467
- Assignees
- 194
- Inventors
- 1,062
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 10 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 12 | 0 |
| 1994 | 3 | 0 |
| 1995 | 11 | 0 |
| 1996 | 20 | 0 |
| 1997 | 16 | 0 |
| 1998 | 18 | 0 |
| 1999 | 21 | 0 |
| 2000 | 24 | 0 |
| 2001 | 24 | 6 |
| 2002 | 26 | 16 |
| 2003 | 14 | 18 |
| 2004 | 13 | 19 |
| 2005 | 6 | 22 |
| 2006 | 6 | 31 |
| 2007 | 15 | 15 |
| 2008 | 8 | 18 |
| 2009 | 11 | 16 |
| 2010 | 12 | 27 |
| 2011 | 17 | 18 |
| 2012 | 16 | 13 |
| 2013 | 21 | 20 |
| 2014 | 24 | 15 |
| 2015 | 14 | 26 |
| 2016 | 14 | 18 |
| 2017 | 18 | 22 |
| 2018 | 21 | 16 |
| 2019 | 9 | 17 |
| 2020 | 25 | 20 |
| 2021 | 12 | 13 |
| 2022 | 18 | 13 |
| 2023 | 8 | 21 |
| 2024 | 10 | 23 |
| 2025 | 13 | 11 |
| 2026 | 13 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cellulosic fiber material and process29 Sep 2026US 12,747,537 B2PaperShell AB
- Gas barrier film for packaging material25 Aug 2026US 12,715,668 B2Stora Enso OYJ
- Additive compositions for papermaking5 May 2026US 12,618,197 B2Solenis Technologies, L.P.
- Sanitary tissue product towels comprising non-wood fibers21 Apr 2026US 12,606,961 B2The Procter & Gamble Company
- Sanitary tissue products comprising once-dried fibers31 Mar 2026US 12,590,418 B2The Procter & Gamble Company
- Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids30 Jul 2026US 2026/0218455 A1
- Premium Sanitary Tissue Products Comprising Non-wood Fibers30 Jul 2026US 2026/0218456 A1The Procter & Gamble Company
- Stretchable paper23 Jul 2026US 2026/0210057 A1Billerud Aktiebolag (publ)
- Sanitary Tissue Products Comprising Once-Dried Fibers18 Jun 2026US 2026/0168177 A1The Procter & Gamble Company
- Characteristics of Non-wood Fibers and the Sanitary Tissue Products Comprising Them30 Apr 2026US 2026/0117464 A1The Procter & Gamble Company
Most cited
By later US patents
- Production of paper and paperboard198US 4,753,710 AAllied Colloids Limited · 1988
- Polysilicate microgels as retention/drainage aids in papermaking126US 4,954,220 AE. I. Du Pont de Nemours and Company · 1990
- Process for production of paper or board123US 9,605,382 B2Kemira Oyj · 2017
- Production of paper and paper board121US 4,913,775 AAllied Colloids Limited · 1990
- Bulk enhanced paperboard and shaped products made therefrom117US 6,379,497 B1Fort James Corporation · 2002