B01J 2231/12
Olefin polymerisation or copolymerisation
B01J2231/12 (Olefin polymerisation or copolymerisation) appears on 349 US grants and 315 published applications in this corpus.
Search patents in B01J- Granted patents
- 349
- Published applications
- 315
- Assignees
- 166
- Inventors
- 954
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 3 | 0 |
| 2000 | 9 | 0 |
| 2001 | 13 | 5 |
| 2002 | 13 | 8 |
| 2003 | 11 | 14 |
| 2004 | 8 | 21 |
| 2005 | 12 | 29 |
| 2006 | 16 | 23 |
| 2007 | 25 | 21 |
| 2008 | 14 | 20 |
| 2009 | 7 | 8 |
| 2010 | 15 | 14 |
| 2011 | 18 | 11 |
| 2012 | 10 | 8 |
| 2013 | 9 | 7 |
| 2014 | 3 | 4 |
| 2015 | 6 | 7 |
| 2016 | 5 | 5 |
| 2017 | 3 | 8 |
| 2018 | 8 | 15 |
| 2019 | 10 | 30 |
| 2020 | 13 | 13 |
| 2021 | 21 | 10 |
| 2022 | 11 | 5 |
| 2023 | 5 | 2 |
| 2024 | 3 | 7 |
| 2025 | 5 | 7 |
| 2026 | 3 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Cobalt catalysts containing “smart” or “task specific” anions1 Sep 2026US 12,722,146 B2The Texas A&M University System
- Process for the preparation of a multimodal polyethylene7 Apr 2026US 12,595,325 B2Borealis AG
- Metallocene complexes and catalysts made therefrom24 Mar 2026US 12,583,955 B2Borealis AG
- Evolving random heteropolymers towards catalytically active materials28 Oct 2025US 12,454,501 B2Massachusetts Institute of Technology
- Method for preparing cocatalyst compound using anhydrous hydrocarbon solvent3 Jun 2025US 12,318,766 B2LG Chem.Ltd.
- Ziegler-natta catalyst for ethylene polymerization and method for preparing same24 Sep 2026US 2026/0286017 A1Hanwha Solutions Corporation
- Solid titanium catalyst component, catalyst for polymerizing olefin, and method for polymerizing olefin24 Sep 2026US 2026/0286018 A1Mitsui Chemicals, Inc.
- Asymmetrical hafnium metallocenes10 Sep 2026US 2026/0265283 A1Dow Global Technologies LLC
- Symmetrical hafnium metallocene for making polymers with broad-orthogonal composition distributions10 Sep 2026US 2026/0265284 A1Dow Global Technologies LLC
- Symmetrical zirconium metallocenes having isobutyl cyclopentadienyl ligands27 Aug 2026US 2026/0250309 A1Dow Global Technologies LLC
Most cited
By later US patents
- Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts137US 5,770,753 ATargor GmbH · 1998
- Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts123US 5,840,644 ATargor GmbH · 1998
- Vinly-substituted bridged metallocenes111US 5,565,592 APhillips Petroleum Company · 1996
- Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts99US 5,786,432 ATargor GmbH · 1998
- Substituted aminomethylphosphines, compositions and coordination complexes of same, their synthesis and processes using same82US 6,043,363 ASymyx Technologies, Inc. · 2000