D01F 6/74
From polycondensates of cyclic compounds
Official title: from polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
D01F6/74 (From polycondensates of cyclic compounds) appears on 218 US grants and 185 published applications in this corpus.
Search patents in D01F- Granted patents
- 218
- Published applications
- 185
- Assignees
- 126
- Inventors
- 609
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 11 | 0 |
| 1995 | 9 | 0 |
| 1996 | 8 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 1 |
| 2002 | 4 | 3 |
| 2003 | 2 | 3 |
| 2004 | 2 | 2 |
| 2005 | 2 | 5 |
| 2006 | 0 | 6 |
| 2007 | 3 | 2 |
| 2008 | 2 | 8 |
| 2009 | 2 | 15 |
| 2010 | 6 | 20 |
| 2011 | 12 | 7 |
| 2012 | 4 | 10 |
| 2013 | 7 | 11 |
| 2014 | 9 | 9 |
| 2015 | 7 | 15 |
| 2016 | 9 | 6 |
| 2017 | 11 | 13 |
| 2018 | 6 | 13 |
| 2019 | 5 | 7 |
| 2020 | 7 | 7 |
| 2021 | 1 | 3 |
| 2022 | 3 | 4 |
| 2023 | 1 | 5 |
| 2024 | 6 | 4 |
| 2025 | 3 | 5 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of manufacturing nerve electrode23 Sep 2025US 12,420,086 B2University-Industry Cooperation Group of Kyung Hee University
- Composite fiber electrodes and applications of same1 Apr 2025US 12,266,787 B2Vanderbilt University
- High-whiteness polyimide microfiber and preparation method thereof and use4 Mar 2025US 12,241,179 B2China University of Geosciences (Beijing)
- Method of making a phosphonated PBI fiber20 Aug 2024US 12,065,763 B2PBI Performance Products, Inc.
- Polymer filaments comprising an aqueous-soluble imide polymer and use thereof as a sacrificial printing material in additive manufacturing4 Jun 2024US 11,999,862 B2Xerox Corporation
- Preparation of ultrafine polyimide nanofiber membrane at high voltage and use of membrane in high-temperature filtration2 Apr 2026US 2026/0092402 A1University of South China
- Fiber-reinforced resin molded body27 Nov 2025US 2025/0361370 A1I.S.T. Corporation
- Resin sheet and resin molding18 Sep 2025US 2025/0290232 A1Maxell, Ltd.
- Polyamide-imide resin, polyamide-imide fiber, nonwoven fabric, and separator for electronic component5 Jun 2025US 2025/0183478 A1TOYOBO MC Corporation
- Graphitization of Electrospun Polyimide Nanofiber17 Apr 2025US 2025/0122650 A2George Mason University
Most cited
By later US patents
- Hollow fiber membranes and method of manufacture123US 5,762,798 AMinntech Corporation · 1998
- Rigid rod polymer based on pyridobisimidazole90US 5,674,969 AAkzo Nobel N. V. · 1997
- Compositions comprising rigid-rod polymers and carbon nanotubes and process for making the same79US 6,900,264 B2Georgia Tech Research Corporation · 2005
- Liquid crystalline poly (2,6-benzothiazole) compositions, process, and products60US 4,533,724 ASRI International · 1985
- Process for preparing shaped articles of rigid rod heterocyclic liquid crystalline polymers48US 4,606,875 ACelanese Corporation · 1986