D21F 13/00
Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web
Official title: Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production (making discontinuous sheets of board in moulds D21J; drying paper, pulpboard, or cardboard, in discontinuous sheet form F26B)
D21F13/00 (Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web) appears on 60 US grants and 68 published applications in this corpus.
Search patents in D21F- Granted patents
- 60
- Published applications
- 68
- Assignees
- 46
- Inventors
- 164
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 3 |
| 2013 | 2 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 2 |
| 2018 | 2 | 4 |
| 2019 | 3 | 6 |
| 2020 | 6 | 6 |
| 2021 | 4 | 7 |
| 2022 | 1 | 5 |
| 2023 | 6 | 5 |
| 2024 | 6 | 10 |
| 2025 | 5 | 3 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Air and water barrier building panels15 Sep 2026US 12,734,724 B2Gold Bond Building Products, LLC
- Method, apparatus, and system of a fibrillated nanocellulose material4 Aug 2026US 12,698,596 B2Ecoinno (H.K.) Limited
- Apparatus and method for heated pulp press with integral elements for improved efficiencies14 Jul 2026US 12,679,061 B2Motus Co., Ltd.
- Method for hot pressing preforms from a fiber-containing material10 Mar 2026US 12,571,162 B2KIEFEL GmbH
- 3D printed tooling for pulp molding process25 Nov 2025US 12,480,257 B2Papacks Sales GmbH
- Compostable sleeve apparatus and method of manufacture17 Sep 2026US 2026/0274549 A1
- Unidirectional wood fiber paper and preparation method therefor, unidirectional wood fiber paper prepreg and preparation method therefor, and wood fiber paper-reinforced composite material17 Sep 2026US 2026/0275640 A1Freshape SA
- Papermaking mat and method for producing paper making mat3 Sep 2026US 2026/0258606 A1Ibiden Co., Ltd.
- Papermaking mat and method for producing paper making mat27 Aug 2026US 2026/0250908 A1Ibiden Co., Ltd.
- Separation device, sheet production apparatus, and method of producing filtration product19 Mar 2026US 2026/0077282 A1Seiko Epson Corporation
Most cited
By later US patents
- Fiber reinforced plastic articles and method of preparation54US 3,954,555 ANational Gypsum Company · 1976
- Ultrasonic welding of wet laid nonwoven compositions22US 11,118,313 B2Eastman Chemical Company · 2021
- Paper-making kit with improved basin and web supporting screen20US 5,351,931 A1994
- Method of manufacturing an inorganic board20US 5,681,428 ANichiha Corporation · 1997
- Inorganic composition for high temperature use and method of forming a millboard therefrom17US 3,954,556 AJohns Manville · 1976