D21H 13/22
Condensation polymers of aldehydes or ketones
D21H13/22 (Condensation polymers of aldehydes or ketones) appears on 10 US grants and 7 published applications in this corpus.
Search patents in D21H- Granted patents
- 10
- Published applications
- 7
- Assignees
- 11
- Inventors
- 28
- Latest grant
- 16 Jan 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Gas diffusion layer for proton exchange membrane fuel cell and preparation method thereof16 Jan 2024US 11,876,232 B2Donghua University
- Electrode substrate for electrochemical cell from carbon and cross-linkable resin fibers30 Oct 2012US 8,298,725 B2UTC Power Corporation
- Nonwoven mat, method for production thereof and fibre composite19 Oct 2010US 7,816,290 B2Frenzelit-Werke GmbH & Co. KG
- Base webs for printed circuit board production using the foam process and acrylic fibers9 Apr 2002US 6,368,698 B1Ahlstrom Glassfibre Oy
- Base webs for printed circuit board production using the foam process and acrylic fibers10 Jul 2001US 6,258,203 B1Ahlstrom Glassfibre Oy
- Gas diffusion layer for proton exchange membrane fuel cell and preparation method thereof7 Dec 2023US 2023/0395815 A1Donghua University
- Paper Sheet and Method of Making It27 Jan 2022US 2022/0022529 A1Schweitzer-Mauduit International, Inc.
- Flushable moist wipe or hygiene tissue and a method for making it10 Jul 2014US 2014/0189970 A1SCA Hygiene Products AB
- Electrode substrate for electrochemical cell from carbon and cross-linkable resin fibers11 Feb 2010US 2010/0035126 A1UTC Power Corporation
- Nonwoven mat, method for production thereof and fibre composite31 May 2007US 2007/0123132 A1Frenzelit-Werke GmbH & Co. KG
Most cited
By later US patents
- Friction paper containing activated carbon17US 5,989,390 AKnowlton Specialty Papers, Inc. · 1999
- Method of making a laminated sheet product14US 4,472,229 AImperial Chemical Industries PLC · 1984
- Base webs for printed circuit board production using the foam process and acrylic fibers12US 6,258,203 B1Ahlstrom Glassfibre Oy · 2001
- Radiation shielding phenolic fibers and method of producing same7US 3,961,123 AKanebo, Ltd. · 1976
- Electrical insulating paper5US 5,478,640 ABASF SE · 1995