C04B 2235/322
Transition aluminas
Official title: Transition aluminas, e.g. delta or gamma aluminas
C04B2235/322 (Transition aluminas) appears on 149 US grants and 204 published applications in this corpus.
Search patents in C04B- Granted patents
- 149
- Published applications
- 204
- Assignees
- 97
- Inventors
- 411
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 4 |
| 2004 | 4 | 7 |
| 2005 | 5 | 15 |
| 2006 | 5 | 18 |
| 2007 | 6 | 12 |
| 2008 | 3 | 14 |
| 2009 | 10 | 16 |
| 2010 | 10 | 8 |
| 2011 | 11 | 7 |
| 2012 | 5 | 14 |
| 2013 | 7 | 6 |
| 2014 | 6 | 8 |
| 2015 | 6 | 11 |
| 2016 | 10 | 4 |
| 2017 | 9 | 8 |
| 2018 | 6 | 11 |
| 2019 | 9 | 12 |
| 2020 | 6 | 7 |
| 2021 | 5 | 4 |
| 2022 | 5 | 1 |
| 2023 | 7 | 9 |
| 2024 | 2 | 5 |
| 2025 | 2 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for producing a porous alpha-alumina catalyst support16 Jun 2026US 12,654,152 B2BASF SE
- Plate-like alumina particle and method for manufacturing plate-like alumina particle17 Feb 2026US 12,552,715 B2DIC Corporation
- Porous ceramic separator materials and formation processes23 Sep 2025US 12,424,665 B2Apple Inc.
- Process for producing microcrystalline alpha-alumina by microwave calcination24 Jun 2025US 12,338,180 B2Henan Changxing Industry Co,Ltd.
- Bonded abrasive article including elongate shaped abrasive particles19 Mar 2024US 11,932,580 B23M Innovative Properties Company
- Process for preparing a green multilayer sol-gel ceramic membrane2 Apr 2026US 2026/0092013 A1Petroleo Brasileiro S.A. - Petrobras
- Process for production of monolith compacted alumina material for single crystal growth18 Dec 2025US 2025/0382235 A1Aem Technologies Inc.
- Sintered body, method for producing sintered body, powder and calcined body15 May 2025US 2025/0154067 A1Tosoh Corporation
- High purity tableted alpha-alumina catalyst support5 Sep 2024US 2024/0293802 A1BASF SE
- High-purity compact calcium hexa-aluminate-based refractory material and preparation method therefor1 Aug 2024US 2024/0254051 A1University of Science and Technology Beijing
Most cited
By later US patents
- Mixed-metal oxide particles by liquid feed flame spray pyrolysis of oxide precursors in oxygenated solvents114US 7,220,398 B2TAL Materials & The Regents of the University of Michigan · 2007
- Thermal shock resistant ceramic composites97US 7,488,544 B2Stanton Advanced Ceramics, Inc. · 2009
- Thermal shock resistant ceramic composites95US 7,666,344 B2Stanton Advanced Ceramics, Inc. · 2010
- Mullite-aluminum titanate diesel exhaust filter66US 6,849,181 B2Corning Incorporated · 2005
- Ceramic fiber-reinforced composite articles and their production48US 5,436,042 AThe Carborundum Company · 1995