B01J 2531/49
Hafnium
B01J2531/49 (Hafnium) appears on 313 US grants and 267 published applications in this corpus.
Search patents in B01J- Granted patents
- 313
- Published applications
- 267
- Assignees
- 120
- Inventors
- 664
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 8 | 0 |
| 1996 | 9 | 0 |
| 1997 | 9 | 0 |
| 1998 | 9 | 0 |
| 1999 | 13 | 0 |
| 2000 | 14 | 0 |
| 2001 | 15 | 2 |
| 2002 | 24 | 15 |
| 2003 | 13 | 11 |
| 2004 | 9 | 14 |
| 2005 | 14 | 17 |
| 2006 | 9 | 9 |
| 2007 | 12 | 8 |
| 2008 | 6 | 11 |
| 2009 | 5 | 8 |
| 2010 | 7 | 10 |
| 2011 | 9 | 12 |
| 2012 | 8 | 14 |
| 2013 | 10 | 14 |
| 2014 | 5 | 25 |
| 2015 | 11 | 10 |
| 2016 | 5 | 5 |
| 2017 | 9 | 11 |
| 2018 | 8 | 9 |
| 2019 | 12 | 16 |
| 2020 | 6 | 8 |
| 2021 | 11 | 6 |
| 2022 | 4 | 14 |
| 2023 | 6 | 4 |
| 2024 | 3 | 5 |
| 2025 | 6 | 3 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Catalytic hydrogenolysis of a polymer25 Aug 2026US 12,715,826 B2Northwestern University
- Carbamate production method, carbamate ester production method, and urea derivative production method12 May 2026US 12,623,999 B2National Institute of Advanced Industrial Science and Technology
- Metal organic framework and use thereof for generating H25 May 2026US 12,616,966 B2Centre National De La Recherche Scientifique
- Alkylation of transition metal coordination catalyst complexes20 Jan 2026US 12,528,892 B2ExxonMobil Chemical Patents Inc.
- Cyclopentadienyl/adamantyl phosphinimine zirconium and hafnium complexes2 Dec 2025US 12,486,342 B2NOVA Chemicals (International) S.A.
- 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
- Transition Metal Compound and Catalyst Composition Comprising the Same16 Jul 2026US 2026/0200955 A1LG Chem.Ltd.
- Hydrocarbyl silyl-substituted ansa-metallocenes and process for preparing low melt elasticity polyolefins14 May 2026US 2026/0131320 A1Formosa Plastics Corporation, U. S. A
- Method of making a morphology-improved polyethylene powder9 Apr 2026US 2026/0098112 A1Dow Global Technologies LLC
Most cited
By later US patents
- Catalyst system of enhanced productivity544US 5,153,157 AExxon Chemical Patents Inc. · 1992
- Compositions that can produce polymers334US 6,300,271 B1Phillips Petroleum Company · 2001
- Organometal catalyst compositions329US 6,355,594 B1Phillips Petroleum Company · 2002
- Organometal catalyst compositions300US 6,376,415 B1Phillips Petroleum Company · 2002
- Organometal compound catalyst286US 6,391,816 B1Phillips Petroleum Company · 2002