B01D 71/64
Polyimides
Official title: Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
B01D71/64 (Polyimides) appears on 607 US grants and 651 published applications in this corpus.
Search patents in B01D- Granted patents
- 607
- Published applications
- 651
- Assignees
- 293
- Inventors
- 1,410
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 8 | 0 |
| 1990 | 21 | 0 |
| 1991 | 25 | 0 |
| 1992 | 10 | 0 |
| 1993 | 14 | 0 |
| 1994 | 11 | 0 |
| 1995 | 7 | 0 |
| 1996 | 3 | 0 |
| 1997 | 13 | 0 |
| 1998 | 17 | 0 |
| 1999 | 11 | 0 |
| 2000 | 0 | 0 |
| 2001 | 5 | 0 |
| 2002 | 8 | 13 |
| 2003 | 12 | 13 |
| 2004 | 5 | 7 |
| 2005 | 3 | 12 |
| 2006 | 5 | 14 |
| 2007 | 7 | 9 |
| 2008 | 5 | 15 |
| 2009 | 8 | 13 |
| 2010 | 14 | 23 |
| 2011 | 6 | 24 |
| 2012 | 14 | 20 |
| 2013 | 21 | 17 |
| 2014 | 14 | 26 |
| 2015 | 19 | 43 |
| 2016 | 31 | 56 |
| 2017 | 30 | 36 |
| 2018 | 35 | 44 |
| 2019 | 28 | 44 |
| 2020 | 32 | 39 |
| 2021 | 32 | 35 |
| 2022 | 20 | 30 |
| 2023 | 24 | 38 |
| 2024 | 26 | 32 |
| 2025 | 20 | 26 |
| 2026 | 12 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for the separation of phosphorus pentafluoride from hydrogen chloride11 Aug 2026US 12,702,948 B2Mexichem Fluor S.A. De C.V.
- Hollow fiber and a process for preparation thereof21 Jul 2026US 12,685,972 B2E. & J. Gallo Winery
- Fluid separation membranes and use thereof7 Jul 2026US 12,673,298 B1Semicom Dwc-LLC
- Method of creating greater adhesion between asymmetric PVDF active layer and PEI fiber support to obtain multilayer janus membrane30 Jun 2026US 12,667,812 B1King Fahd University of Petroleum and Minerals
- Filtering device, purification device, and method for manufacturing chemical liquid16 Jun 2026US 12,654,136 B2FUJIFILM Corporation
- Separation membrane17 Sep 2026US 2026/0273479 A1Nitto Denko Corporation
- Hollow fiber and a process for preparation thereof10 Sep 2026US 2026/0264024 A1
- Dual-layer hollow fibre membrane27 Aug 2026US 2026/0249249 A1Divigas Pet Ltd
- Mixed-matrix metal-organic framework membranes for molecular separations27 Aug 2026US 2026/0249253 A1King Abdullah University of Science and Technology
- Organic solvent regenerator, substrate processing system, and method of regenerating organic solvent27 Aug 2026US 2026/0250222 A1SCREEN Holdings Co., Ltd.
Most cited
By later US patents
- Porous microfabricated polymer membrane structures460US 5,807,406 ABaxter International Inc. · 1998
- Composite solid polymer electrolyte membranes346US 7,550,216 B2Foster-Miller, Inc. · 2009
- Composite solid polymer electrolyte membranes158US 6,248,469 B1Foster-Miller, Inc. · 2001
- Method of making a product with a micro or nano sized structure and product158US 7,531,120 B2Aquamarijn Holding B.V. · 2009
- Novel multicomponent fluid separation membranes140US 5,085,676 AE. I. Du Pont de Nemours and Company · 1992