B01D 71/50
Polycarbonates
B01D71/50 (Polycarbonates) appears on 121 US grants and 114 published applications in this corpus.
Search patents in B01D- Granted patents
- 121
- Published applications
- 114
- Assignees
- 98
- Inventors
- 365
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 3 |
| 2004 | 1 | 0 |
| 2005 | 1 | 2 |
| 2006 | 1 | 3 |
| 2007 | 1 | 2 |
| 2008 | 0 | 3 |
| 2009 | 0 | 4 |
| 2010 | 1 | 3 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 7 | 3 |
| 2014 | 2 | 9 |
| 2015 | 2 | 6 |
| 2016 | 4 | 6 |
| 2017 | 7 | 12 |
| 2018 | 3 | 9 |
| 2019 | 7 | 9 |
| 2020 | 6 | 12 |
| 2021 | 7 | 4 |
| 2022 | 6 | 5 |
| 2023 | 2 | 5 |
| 2024 | 2 | 5 |
| 2025 | 2 | 1 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cell retention device18 Aug 2026US 12,708,876 B2Sunflower Therapeutics, PBC
- Viability detection and quantification assay of waterborne pathogens by enrichment19 May 2026US 12,630,885 B2Phigenics, LLC
- Gas separation method and apparatus8 Jul 2025US 12,350,624 B2Renaissance Energy Research Corporation
- Rotary filter apparatus for roll-to-roll nanomaterial dispersion papermaking1 Jul 2025US 12,343,683 B2Bulk Nano Processing LLC
- Electrophoresis device5 Nov 2024US 12,134,781 B2Memphasys Limited
- Reverse electro-osmotic filtration exploiting nanofluidic transport through asymmetric membrane13 Aug 2026US 2026/0233166 A1
- Self-Assembled Ionic Liquid Layer21 May 2026US 2026/0138098 A1National Technology & Engineering Solutions of Sandia, LLC
- Materials, methods, and sampling devices for preserving and extracting extracellular vesicles in biofluids5 Feb 2026US 2026/0034544 A1Purdue Research Foundation
- Ordered Metal Organic Framework Polymer Membranes15 Jan 2026US 2026/0014528 A1University of Connecticut
- Gas separation membrane26 Jun 2025US 2025/0205637 A1Idemitsu Kosan Co., Ltd.
Most cited
By later US patents
- Dihydroxydiphenyl cycloalkanes, their production and their use for the production of high molecular weight polycarbonates183US 4,982,014 ABayer Aktiengesellschaft · 1991
- Polycarbonate-polyether-copolymer membrane91US 4,686,044 AAkzo N. V. · 1987
- Gas separations utilizing glassy polymer membranes at sub-ambient temperatures80US 5,837,032 AThe Cynara Company · 1998
- Polycarbonate from dihydroxy diphenyl cycloalkane61US 5,126,428 ABayer Aktiengesellschaft · 1992
- Gas separations utilizing glassy polymer membranes at sub-ambient temperatures42US 5,352,272 AThe Dow Chemical Company · 1994