D21H 21/34
Ignifugeants
D21H21/34 (Ignifugeants) appears on 166 US grants and 146 published applications in this corpus.
Search patents in D21H- Granted patents
- 166
- Published applications
- 146
- Assignees
- 147
- Inventors
- 408
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 6 |
| 2004 | 2 | 7 |
| 2005 | 2 | 6 |
| 2006 | 1 | 2 |
| 2007 | 2 | 4 |
| 2008 | 1 | 6 |
| 2009 | 2 | 7 |
| 2010 | 3 | 5 |
| 2011 | 2 | 8 |
| 2012 | 4 | 6 |
| 2013 | 6 | 15 |
| 2014 | 8 | 7 |
| 2015 | 4 | 5 |
| 2016 | 5 | 5 |
| 2017 | 5 | 3 |
| 2018 | 3 | 6 |
| 2019 | 2 | 6 |
| 2020 | 5 | 7 |
| 2021 | 7 | 10 |
| 2022 | 3 | 6 |
| 2023 | 3 | 8 |
| 2024 | 4 | 7 |
| 2025 | 7 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Flame-proof corrugated paperboard and method for producing same8 Sep 2026US 12,729,485 B2Rengo Co., Ltd.
- Polypropylene coated paper and paperboard3 Feb 2026US 12,540,439 B2Stora Enso OYJ
- Heat-resistant wrapper paper for aerosol-generating articles14 Oct 2025US 12,442,137 B2delfortgroup AG
- Method and aqueous composition for preventing wildfire2 Sep 2025US 12,403,339 B2Xpyro Oy
- Paper-based electromagnetic shielding composite with flame retardant properties and its preparation method and application12 Aug 2025US 12,385,186 B2Jiangnan University
- Process for producing rigid cellulosic product20 Aug 2026US 2026/0243023 A1Honext Material, Sl
- Thermal insulating/flame barrier sheet and battery pack and battery module package using the same9 Oct 2025US 2025/0316791 A1Imae Industries, Ltd.
- Hybrid fire retardant insulation and method of making the same6 Mar 2025US 2025/0075433 A1Cleanfiber Inc.
- Non-Combustible Wrapper For Use In Heat But Not Burn Applications7 Nov 2024US 2024/0365850 A1SWM Holdings US, LLC
- Flame-proof corrugated paperboard and method for producing same31 Oct 2024US 2024/0360627 A1Rengo Co., Ltd.
Most cited
By later US patents
- Intumescent sheet material103US 4,305,992 AMinnesota Mining and Manufacturing Company · 1981
- New flame retardant compositions of matter and cellulosic products containing same74US 4,888,136 AWitco Corporation · 1989
- Method for producing cellulose insulation materials using liquid fire retardant compositions70US 5,534,301 AEchochem International, Inc. · 1996
- Paper having crossdirectional regions of variable basis weight68US 5,474,095 APhilip Morris Incorporated · 1995
- Addition of endothermic fire retardants to provide near neutral pH pulp fiber webs65US 8,871,058 B2International Paper Company · 2014