D21H 23/04
Addition to the pulp
Official title: Addition to the pulp; After-treatment of added substances in the pulp
D21H23/04 (Addition to the pulp) appears on 455 US grants and 411 published applications in this corpus.
Search patents in D21H- Granted patents
- 455
- Published applications
- 411
- Assignees
- 225
- Inventors
- 1,040
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 10 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 14 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 9 | 0 |
| 1997 | 14 | 0 |
| 1998 | 10 | 0 |
| 1999 | 20 | 0 |
| 2000 | 22 | 0 |
| 2001 | 10 | 0 |
| 2002 | 13 | 11 |
| 2003 | 12 | 13 |
| 2004 | 14 | 19 |
| 2005 | 3 | 15 |
| 2006 | 5 | 10 |
| 2007 | 12 | 25 |
| 2008 | 5 | 14 |
| 2009 | 5 | 14 |
| 2010 | 9 | 18 |
| 2011 | 13 | 6 |
| 2012 | 9 | 9 |
| 2013 | 14 | 16 |
| 2014 | 13 | 16 |
| 2015 | 11 | 19 |
| 2016 | 13 | 17 |
| 2017 | 14 | 15 |
| 2018 | 14 | 15 |
| 2019 | 8 | 22 |
| 2020 | 20 | 26 |
| 2021 | 19 | 32 |
| 2022 | 24 | 14 |
| 2023 | 13 | 16 |
| 2024 | 8 | 27 |
| 2025 | 15 | 15 |
| 2026 | 9 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method, apparatus, and system of a fibrillated nanocellulose material4 Aug 2026US 12,698,596 B2Ecoinno (H.K.) Limited
- Method for producing wet-running friction paper28 Jul 2026US 12,692,663 B2Schaeffler Technologies AG & Co. KG
- Softener concentrate, softener emulsion, method for producing softener emulsion and its use14 Jul 2026US 12,680,231 B2Kemira Oyj
- Composition for improving softness of tissue and/or towel products12 May 2026US 12,624,503 B2Solenis Technologies, L.P.
- Treatment system for manufacture of paper, board or the like21 Apr 2026US 12,606,959 B2Kemira Oyj
- Treatment system and method for manufacture of paper, board or the like27 Aug 2026US 2026/0250909 A1Kemira Oyj
- Dual emulsification of alkenyl succinic anhydride to improve sizing performance and stability20 Aug 2026US 2026/0243024 A1Kemira Oyj
- Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids30 Jul 2026US 2026/0218455 A1
- Novel composition and method for papermaking2 Jul 2026US 2026/0185303 A1Ecolab USA Inc.
- A method for reducing the load of microbial contaminants in a pulp stock comprising a recycled fiber fraction16 Apr 2026US 2026/0103843 A1Stora Enso OYJ
Most cited
By later US patents
- Production of paper and paperboard198US 4,753,710 AAllied Colloids Limited · 1988
- Adsorptive nonwoven fabric comprising fused fibers, non-fused fibers and absorptive material and method of making same154US 4,160,059 AHonshu Seishi Kabushiki Kaisha · 1979
- Soft tissue having temporary wet strength148US 6,149,769 AThe Procter & Gamble Company · 2000
- Highly loaded fiber-based composite material146US 5,731,080 AInternational Paper Company · 1998
- Production of paper and paper board121US 4,913,775 AAllied Colloids Limited · 1990