D21H 13/26
Polyamides
Official title: Polyamides; Polyimides
D21H13/26 (Polyamides) appears on 270 US grants and 238 published applications in this corpus.
Search patents in D21H- Granted patents
- 270
- Published applications
- 238
- Assignees
- 172
- Inventors
- 707
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 7 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 12 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 17 | 4 |
| 2002 | 13 | 10 |
| 2003 | 11 | 13 |
| 2004 | 5 | 12 |
| 2005 | 6 | 11 |
| 2006 | 5 | 11 |
| 2007 | 2 | 13 |
| 2008 | 5 | 4 |
| 2009 | 1 | 7 |
| 2010 | 6 | 10 |
| 2011 | 2 | 5 |
| 2012 | 5 | 5 |
| 2013 | 4 | 12 |
| 2014 | 4 | 9 |
| 2015 | 4 | 11 |
| 2016 | 7 | 11 |
| 2017 | 5 | 10 |
| 2018 | 6 | 9 |
| 2019 | 6 | 10 |
| 2020 | 7 | 11 |
| 2021 | 7 | 14 |
| 2022 | 8 | 12 |
| 2023 | 12 | 7 |
| 2024 | 7 | 5 |
| 2025 | 3 | 5 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Impregnating coating layer for insulating sheetsand multilayer laminates15 Sep 2026US 12,734,766 B2Coveme S.P.A.
- Circuit board unwoven fabric, circuit board prepreg using same and circuit board using same23 Jun 2026US 12,662,775 B2Dupont Safety & Construction, Inc.
- Electrical insulation paper12 May 2026US 12,626,836 B2Ahlstrom Oyj
- Solid-state composite electrolytes comprising aramid polymer fibrils17 Mar 2026US 12,580,221 B2Dupont Safety & Construction, Inc.
- Paper-based electromagnetic shielding composite with flame retardant properties and its preparation method and application12 Aug 2025US 12,385,186 B2Jiangnan University
- Polyimide fibre paper1 Oct 2026US 2026/0297851 A1Dupont Electronics, Inc.
- Carbon material precursor and method for producing carbon material using same30 Jul 2026US 2026/0218454 A1Nippon Paper Industries Co., Ltd.
- Fibrous structure, thermal insulation material, housing device, battery, flight vehicle, and method for producing fibrous structure23 Jul 2026US 2026/0213305 A1SoftBank Corp.
- Non-Woven Fabric16 Jul 2026US 2026/0201615 A1Asahi Kasei Kabushiki Kaisha
- Papers Having Low Density and High Average Specific Modulus12 Mar 2026US 2026/0071385 A1Dupont Safety & Construction, Inc.
Most cited
By later US patents
- Fibrous structures containing immobilized particulate matter181US 5,486,410 AHoechst Celanese Corporation · 1996
- Cloth-like base sheet and method for making the same144US 6,315,864 B2Kimberly-Clark Worldwide, Inc. · 2001
- Cellulose-Based medical packaging material sterilizable by oxidizing gas plasma127US 6,156,677 AKimberly-Clark Worldwide, Inc. · 2000
- Wet laid bonded fibrous web containing bicomponent fibers including LLDPE116US 5,167,765 AHoechst Celanese Corporation · 1992
- Fibrous structures containing particulate and including microfiber web102US 5,605,746 AHoechst Celanese Corporation · 1997