C04B 2235/72
Products characterised by the absence or the low content of specific components
Official title: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
C04B2235/72 (Products characterised by the absence or the low content of specific components) appears on 1,665 US grants and 2,128 published applications in this corpus.
Search patents in C04B- Granted patents
- 1,665
- Published applications
- 2,128
- Assignees
- 812
- Inventors
- 4,202
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 11 | 0 |
| 1992 | 11 | 0 |
| 1993 | 7 | 0 |
| 1994 | 9 | 0 |
| 1995 | 7 | 0 |
| 1996 | 9 | 0 |
| 1997 | 12 | 0 |
| 1998 | 7 | 0 |
| 1999 | 12 | 0 |
| 2000 | 17 | 0 |
| 2001 | 11 | 6 |
| 2002 | 27 | 26 |
| 2003 | 25 | 72 |
| 2004 | 49 | 84 |
| 2005 | 35 | 93 |
| 2006 | 48 | 68 |
| 2007 | 40 | 77 |
| 2008 | 39 | 67 |
| 2009 | 54 | 101 |
| 2010 | 68 | 121 |
| 2011 | 73 | 103 |
| 2012 | 72 | 114 |
| 2013 | 83 | 98 |
| 2014 | 67 | 91 |
| 2015 | 84 | 101 |
| 2016 | 82 | 74 |
| 2017 | 82 | 91 |
| 2018 | 72 | 87 |
| 2019 | 69 | 81 |
| 2020 | 62 | 102 |
| 2021 | 70 | 97 |
| 2022 | 70 | 88 |
| 2023 | 74 | 101 |
| 2024 | 54 | 92 |
| 2025 | 64 | 59 |
| 2026 | 45 | 34 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C04B 2235/721Carbon contentIndexing code248
- C04B 2235/723Oxygen contentIndexing code158
- C04B 2235/725Metal contentIndexing code144
- C04B 2235/727Phosphorus or phosphorus compound contentIndexing code138
- C04B 2235/728Silicon contentIndexing code138
- C04B 2235/726Sulfur contentIndexing code92
- C04B 2235/724Halogenide contentIndexing code80
- C04B 2235/722Nitrogen contentIndexing code64
Recent patents
- Batch for the production of a coarse ceramic refractory basic product, such product and method for its production, lining of an industrial furnace and industrial furnace25 Aug 2026US 12,715,815 B2Refratechnik Holding GmbH
- High-zirconia electro-fused cast refractory material25 Aug 2026US 12,715,817 B2Saint-Gobain TM K.K.
- Magnetic ball11 Aug 2026US 12,703,666 B2Saint-Gobain Centre De Recherches Et D ' Etudes Europeen
- Methods of providing high purity SiOC and SiC materials4 Aug 2026US 12,698,241 B2Pallidus, Inc.
- Composite polycrystal and tool with composite polycrystal28 Jul 2026US 12,692,200 B2Sumitomo Electric Hardmetal Corp.
- High Purity SiOC and SiC, Methods Compositions and Applications1 Oct 2026US 2026/0296898 A1Pallidus, Inc.
- Improved aluminum-containing nitride ceramic matrix composite, method of making, and method of use20 Aug 2026US 2026/0242660 A1SLT Technologies, Inc.
- Ceramic body and electric heater13 Aug 2026US 2026/0239494 A1NGK Insulators, Ltd.
- Zirconia mill blank6 Aug 2026US 2026/0225958 A1Shofu Inc.
- Dielectric composition, dielectric element, and laminated electronic component23 Jul 2026US 2026/0209124 A1Niterra Co., Ltd.
Most cited
By later US patents
- High lifetime consumable silicon nitride-silicon dioxide plasma processing components168US 8,622,021 B2Ceradyne, Inc. · 2014
- Polycrystalline translucent alumina-based ceramic material, uses, and methods166US 6,878,456 B23M Innovative Properties Company · 2005
- Silicon carbide and silicon bonded polycrystalline diamond body and method of making it157US 4,151,686 AGeneral Electric Company · 1979
- Very high purity fine powders and methods to produce such powders142US 6,569,397 B12003
- Methods to partially reduce a niobium metal oxide and oxygen reduced niobium oxides131US 6,391,275 B1Cabot Corporation · 2002