C01F 7/02
Aluminium oxide
Official title: Aluminium oxide; Aluminium hydroxide; Aluminates
C01F7/02 (Aluminium oxide) appears on 2,071 US grants and 1,627 published applications in this corpus.
Search patents in C01F- Granted patents
- 2,071
- Published applications
- 1,627
- Assignees
- 1,087
- Inventors
- 4,941
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 44 | 0 |
| 1977 | 47 | 0 |
| 1978 | 47 | 0 |
| 1979 | 36 | 0 |
| 1980 | 39 | 0 |
| 1981 | 43 | 0 |
| 1982 | 30 | 0 |
| 1983 | 32 | 0 |
| 1984 | 36 | 0 |
| 1985 | 38 | 0 |
| 1986 | 47 | 0 |
| 1987 | 40 | 0 |
| 1988 | 38 | 0 |
| 1989 | 38 | 0 |
| 1990 | 23 | 0 |
| 1991 | 40 | 0 |
| 1992 | 33 | 0 |
| 1993 | 26 | 0 |
| 1994 | 33 | 0 |
| 1995 | 33 | 0 |
| 1996 | 33 | 0 |
| 1997 | 24 | 0 |
| 1998 | 42 | 0 |
| 1999 | 28 | 0 |
| 2000 | 44 | 0 |
| 2001 | 42 | 14 |
| 2002 | 32 | 26 |
| 2003 | 45 | 56 |
| 2004 | 31 | 48 |
| 2005 | 16 | 55 |
| 2006 | 34 | 50 |
| 2007 | 20 | 39 |
| 2008 | 25 | 40 |
| 2009 | 23 | 61 |
| 2010 | 39 | 67 |
| 2011 | 42 | 43 |
| 2012 | 33 | 54 |
| 2013 | 45 | 55 |
| 2014 | 45 | 57 |
| 2015 | 44 | 63 |
| 2016 | 46 | 63 |
| 2017 | 60 | 108 |
| 2018 | 64 | 101 |
| 2019 | 79 | 82 |
| 2020 | 70 | 73 |
| 2021 | 51 | 78 |
| 2022 | 61 | 94 |
| 2023 | 49 | 93 |
| 2024 | 65 | 68 |
| 2025 | 56 | 65 |
| 2026 | 40 | 74 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01F 7/04Preparation of alkali metal aluminates474
- C01F 7/34Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts308
- C01F 7/021After-treatment of oxides or hydroxides304
- C01F 7/44Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form275
- C01F 7/30Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis214
- C01F 7/46Purification of aluminium oxide, aluminium hydroxide or aluminates208
- C01F 7/16Preparation of alkaline-earth metal aluminates or magnesium aluminates188
- C01F 7/42Preparation of aluminium oxide or hydroxide from metallic aluminium102
Recent patents
- Absorption method and mesoporous alumina used for the same6 Oct 2026US 12,752,252 B2Fujimi Incorporated
- Method for producing abrasive particles15 Sep 2026US 12,735,614 B2Tyrolit Schleifmittelwerke Swarovski K.G.
- Method for manufacturing a fused metal sight window with a high flow temperature optical material8 Sep 2026US 12,729,155 B2Rayotek Scientific, Inc.
- Polymeric films1 Sep 2026US 12,723,139 B2Salts Healthcare Limited
- Chemical composition and method for microbial inhibiting25 Aug 2026US 12,714,108 B2
- Improved alpha alumina compositions8 Oct 2026US 2026/0308005 A1CoorsTek, Inc.
- Concrete recycling8 Oct 2026US 2026/0308059 A1
- Method for processing of mud water1 Oct 2026US 2026/0296909 A1
- Spherical alumina and supported catalyst, and preparation methods and use thereof17 Sep 2026US 2026/0273511 A1Dalian University of Technology
- Purification method for anhydrous aluminum chloride, and gas-phase nano-alumina preparation device and method therefor17 Sep 2026US 2026/0274702 A1Guangzhou Huifu Research Institute Co., Ltd.
Most cited
By later US patents
- Process for durable sol-gel produced alumina-based ceramics, abrasive grain and abrasive products536US 4,744,802 AMinnesota Mining and Manufacturing Company · 1988
- Abrasive material and method for preparing the same483US 4,623,364 ANorton Company · 1986
- Abrasive grits formed of ceramic containing oxides of aluminum and yttrium, method of making and using the same and products made therewith446US 4,770,671 AMinnesota Mining and Manufacturing Company · 1988
- Thermal oxide equivalent low temperature ALD oxide for dual purpose gate oxide and method for producing the same426US 10,106,892 B1Globalfoundries Inc. · 2018
- Microcrystalline alumina-based ceramic articles245US 5,185,299 AMinnesota Mining and Manufacturing Company · 1993