D21H
Pulp compositions
Official title: Pulp compositions; preparation thereof not covered by subclasses d21c or d21d; impregnating or coating of paper; treatment of finished paper not covered by class b31 or subclass d21g; paper not otherwise provided for
D21H (Pulp compositions) appears on 13,701 US grants and 12,174 published applications in this corpus.
Search patents in D21H- Granted patents
- 13,701
- Published applications
- 12,174
- Assignees
- 3,959
- Inventors
- 23,228
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 204 | 0 |
| 1977 | 151 | 0 |
| 1978 | 167 | 0 |
| 1979 | 109 | 0 |
| 1980 | 155 | 0 |
| 1981 | 191 | 0 |
| 1982 | 166 | 0 |
| 1983 | 196 | 0 |
| 1984 | 206 | 0 |
| 1985 | 205 | 0 |
| 1986 | 165 | 0 |
| 1987 | 171 | 0 |
| 1988 | 179 | 0 |
| 1989 | 219 | 0 |
| 1990 | 217 | 0 |
| 1991 | 212 | 0 |
| 1992 | 262 | 0 |
| 1993 | 247 | 0 |
| 1994 | 214 | 0 |
| 1995 | 246 | 0 |
| 1996 | 287 | 0 |
| 1997 | 316 | 0 |
| 1998 | 309 | 0 |
| 1999 | 340 | 0 |
| 2000 | 327 | 0 |
| 2001 | 376 | 79 |
| 2002 | 338 | 330 |
| 2003 | 309 | 471 |
| 2004 | 272 | 486 |
| 2005 | 190 | 467 |
| 2006 | 183 | 441 |
| 2007 | 206 | 427 |
| 2008 | 157 | 450 |
| 2009 | 160 | 416 |
| 2010 | 274 | 500 |
| 2011 | 305 | 449 |
| 2012 | 310 | 454 |
| 2013 | 383 | 494 |
| 2014 | 394 | 473 |
| 2015 | 323 | 623 |
| 2016 | 375 | 532 |
| 2017 | 376 | 507 |
| 2018 | 393 | 499 |
| 2019 | 385 | 523 |
| 2020 | 441 | 570 |
| 2021 | 396 | 533 |
| 2022 | 389 | 530 |
| 2023 | 354 | 535 |
| 2024 | 379 | 539 |
| 2025 | 327 | 455 |
| 2026 | 245 | 391 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- D21H 17/00Non-fibrous material added to the pulp, characterised by its constitution5,533
- D21H 21/00Non-fibrous material added to the pulp, characterised by its function, form or5,224
- D21H 27/00Special paper not otherwise provided for3,769
- D21H 19/00Coated paper3,390
- D21H 11/00Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only2,142
- D21H 23/00Processes or apparatus for adding material to the pulp or to the1,856
- D21H 13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material1,516
- D21H 25/00After-treatment of paper not provided for in groups d21h17/00 - d21h23/001,337
Recent patents
- Fibrous body processing apparatus6 Oct 2026US 12,753,550 B2Seiko Epson Corporation
- Low cellulosic non-wood fiber products and methods of making the same6 Oct 2026US 12,753,553 B2Archer Daniels Midland Company
- Corrugated board for humid conditions6 Oct 2026US 12,753,554 B2Billerud Aktiebolag (publ)
- Polylactide formulation for improved extrusion processing6 Oct 2026US 12,753,555 B2WestRock MWV, LLC
- Smoking rolling paper and a method for packaging the same29 Sep 2026US 12,745,793 B2
- Sublimation printing transfer paper having tacky properties8 Oct 2026US 2026/0307415 A1
- Arrays of sanitary tissue products comprising non-wood(s)8 Oct 2026US 2026/0307891 A1The Procter & Gamble Company
- Synthetic wax materials with degradable linkers8 Oct 2026US 2026/0308317 A1Board of Trustees of Michigan State University
- Process for producing hygienized pulp8 Oct 2026US 2026/0308846 A1Kemira Oyj
- Single layer coated white kraftliner8 Oct 2026US 2026/0308847 A1
Most cited
By later US patents
- End use applications of biodegradable polymers1,525US 5,444,113 AEcopol, LLC · 1995
- Process for making unitary fibrous structure comprising randomly distributed cellulosic fibers and non-randomly distributed synthetic fibers1,408US 7,067,038 B2The Procter & Gamble Company · 2006
- Method for making a fibrous structure comprising cellulosic and synthetic fibers1,393US 7,354,502 B2The Procter & Gamble Company · 2008
- Diaper having a lotioned topsheet815US 5,643,588 AThe Procter & Gamble Company · 1997
- Hesperaloe tissue having improved cross-machine direction properties809US 10,337,148 B2Kimberly-Clark Worldwide, Inc. · 2019