D21H 13/18
Polymers of unsaturated acids or derivatives thereof
Official title: Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylonitriles
D21H13/18 (Polymers of unsaturated acids or derivatives thereof) appears on 47 US grants and 24 published applications in this corpus.
Search patents in D21H- Granted patents
- 47
- Published applications
- 24
- Assignees
- 36
- Inventors
- 97
- Latest grant
- 21 Nov 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 8 | 1 |
| 2002 | 1 | 4 |
| 2003 | 0 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 1 | 5 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 2 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Airlaid substrates having at least one bicomponent fiber21 Nov 2023US 11,821,141 B2Dow Global Technologies LLC
- Spinning nozzle, process for producing fibrous mass, fibrous mass, and paper12 Oct 2021US 11,142,847 B2Mitsubishi Chemical Corporation
- Process for producing a fibrous bundle via a spinning nozzle5 Dec 2017US 9,834,864 B2Mitsubishi Chemical Corporation
- Polyareneazole/thermoset pulp and methods of making same21 May 2013US 8,444,817 B2E. I. Du Pont de Nemours and Company
- Acrylic fiber bonded carbon fiber paper as gas diffusion media for fuel cell1 Jan 2013US 8,343,452 B2GM Global Technology Operations LLC
- Conductive paper, production method thereof, metallic adherend and production method thereof30 Oct 2025US 2025/0333906 A1NSK-Warner K. K.
- Paper Sheet and Method of Making It27 Jan 2022US 2022/0022529 A1Schweitzer-Mauduit International, Inc.
- Airlaid substrates having at least one bicomponent fiber27 Jan 2022US 2022/0025580 A1Dow Global Technologies LLC
- Thermally conductive electrical insulation material1 Mar 2018US 2018/0061523 A13M Innovative Properties Company
- Spinning nozzle, process for producing fibrous mass, fibrous mass, and paper22 Feb 2018US 2018/0051391 A1Mitsubishi Chemical Corporation
Most cited
By later US patents
- Fibrillated fibers and articles made therefrom100US 5,180,630 AAmerican Cyanamid Company · 1993
- Non-woven activated carbon fabric80US 4,565,727 AAmerican Cyanamid Company · 1986
- Hydrophilic, humectant, soft, pliable, absorbent paper and method for its manufacture72US 6,017,418 AFort James Corporation · 2000
- Absorbent nonwoven fabric and its production50US 5,607,550 ACourtaulds Fibres (Holdings) Limited · 1997
- Nonwoven fabric for separator of non-aqueous electrolyte battery and non-aqueous electrolyte battery using the same49US 6,200,706 B1Mitsubishi Paper Mills Limited · 2001