D21H 27/40
At least one of the sheets being non-planar
Official title: at least one of the sheets being non-planar, e.g. crêped (crêping or corrugating paper B31F)
D21H27/40 (At least one of the sheets being non-planar) appears on 564 US grants and 567 published applications in this corpus.
Search patents in D21H- Granted patents
- 564
- Published applications
- 567
- Assignees
- 137
- Inventors
- 743
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 15 | 0 |
| 1998 | 11 | 0 |
| 1999 | 17 | 0 |
| 2000 | 12 | 0 |
| 2001 | 12 | 1 |
| 2002 | 9 | 6 |
| 2003 | 10 | 19 |
| 2004 | 11 | 16 |
| 2005 | 6 | 15 |
| 2006 | 6 | 7 |
| 2007 | 5 | 9 |
| 2008 | 4 | 8 |
| 2009 | 7 | 15 |
| 2010 | 13 | 7 |
| 2011 | 6 | 9 |
| 2012 | 15 | 14 |
| 2013 | 14 | 15 |
| 2014 | 13 | 23 |
| 2015 | 15 | 29 |
| 2016 | 26 | 30 |
| 2017 | 21 | 32 |
| 2018 | 25 | 26 |
| 2019 | 22 | 33 |
| 2020 | 36 | 35 |
| 2021 | 28 | 43 |
| 2022 | 28 | 40 |
| 2023 | 32 | 44 |
| 2024 | 35 | 39 |
| 2025 | 26 | 17 |
| 2026 | 27 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Corrugated board for humid conditions6 Oct 2026US 12,753,554 B2Billerud Aktiebolag (publ)
- Flame-proof corrugated paperboard and method for producing same8 Sep 2026US 12,729,485 B2Rengo Co., Ltd.
- Soft treated tissue product1 Sep 2026US 12,723,354 B2Kimberly-Clark Worldwide, Inc.
- Tissue product and method and apparatus for producing same25 Aug 2026US 12,716,174 B2Essity Hygiene and Health Aktiebolag
- Coreless rolls of a tissue paper product and methods of manufacturing coreless rolls4 Aug 2026US 12,698,597 B2Essity Hygiene and Health Aktiebolag
- Soft treated tissue product8 Oct 2026US 2026/0308852 A1Kimberly-Clark Worldwide, Inc.
- Discrete cells and emboss elements17 Sep 2026US 2026/0275645 A1The Procter & Gamble Company
- Fibrous structures and methods for making same17 Sep 2026US 2026/0275649 A1The Procter & Gamble Company
- Pae-free papermaking machine and methods of making paper products using the same20 Aug 2026US 2026/0243029 A1First Quality Tissue, LLC
- High basis weight partitionable paper product20 Aug 2026US 2026/0243030 A1
Most cited
By later US patents
- Fabric creped absorbent sheet with variable local basis weight270US 7,494,563 B2Georgia-Pacific Consumer Products LP · 2009
- Fabric crepe process for making absorbent sheet217US 7,399,378 B2Georgia-Pacific Consumer Products LP · 2008
- Multifunctional tissue paper product199US 6,162,327 AThe Procter & Gamble Company · 2000
- Multi-ply fibrous sheet structure and its manufacture187US 4,320,162 AAmerican Can Company · 1982
- Absorbent multilayer sheet and method for making same134US 5,840,404 AFort James France · 1998