D21H 19/30
Polyamides
Official title: Polyamides; Polyimides
D21H19/30 (Polyamides) appears on 29 US grants and 39 published applications in this corpus.
Search patents in D21H- Granted patents
- 29
- Published applications
- 39
- Assignees
- 36
- Inventors
- 122
- Latest grant
- 20 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 2 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 4 |
| 2012 | 2 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 0 |
| 2015 | 1 | 3 |
| 2016 | 2 | 2 |
| 2017 | 0 | 0 |
| 2018 | 1 | 4 |
| 2019 | 2 | 2 |
| 2020 | 2 | 3 |
| 2021 | 0 | 0 |
| 2022 | 2 | 3 |
| 2023 | 1 | 2 |
| 2024 | 1 | 3 |
| 2025 | 1 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tissue paper and method for manufacturing tissue paper20 May 2025US 12,305,335 B2Daio Paper Corporation
- Heat resistant paper-feel overprint varnishes8 Oct 2024US 12,110,417 B2Sun Chemical Corporation
- Multilayer paperboard pouch and method of making the same using conventional bag-making equipment (CBME)28 Nov 2023US 11,827,397 B2Evergreen Packaging Inc.
- High barrier coated paperboard19 Jul 2022US 11,390,438 B2Evergreen Packaging Inc.
- Fluorine-free fibrous treating compositions, treated substrates, and treating methods5 Jul 2022US 11,377,785 B23M Innovative Properties Company
- Surface-modified fibers, method for producing same, and molded article using surface-modified fibers23 Jul 2026US 2026/0210032 A1Kuraray Co., Ltd.
- Water repellent composition2 Jul 2026US 2026/0184907 A1Daikin Industries, Ltd.
- Coated cellulosic structures and method for manufacturing thereof30 Oct 2025US 2025/0333907 A1
- Sequential application of layers, comprising nanocellulose, onto the surface of paper or paperboard substrates23 May 2024US 2024/0167225 A1FiberLean Technologies Limited
- Akd emulsion and method of making16 May 2024US 2024/0158991 A1Solenis Technologies, L.P.
Most cited
By later US patents
- Biodegradable paperboard laminate structure48US 5,213,858 AInternational Paper Company · 1993
- Compositions for imparting desired properties to materials44US 6,586,520 B1Hercules Incorporated · 2003
- Non-chromate conversion coating treatment for metals29US 7,344,607 B2GE Betz, Inc. · 2008
- Coated substrates production23US 3,963,820 AStar Paper Limited · 1976
- Modifying agent for yankee coatings21US 8,101,045 B2Nalco Company · 2012