C04B 2235/766
Trigonal symmetry
Official title: Trigonal symmetry, e.g. alpha-Si3N4 or alpha-Sialon
C04B2235/766 (Trigonal symmetry) appears on 71 US grants and 87 published applications in this corpus.
Search patents in C04B- Granted patents
- 71
- Published applications
- 87
- Assignees
- 61
- Inventors
- 171
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 4 | 4 |
| 2004 | 1 | 5 |
| 2005 | 0 | 4 |
| 2006 | 5 | 6 |
| 2007 | 5 | 8 |
| 2008 | 1 | 9 |
| 2009 | 7 | 5 |
| 2010 | 5 | 7 |
| 2011 | 4 | 3 |
| 2012 | 3 | 5 |
| 2013 | 5 | 4 |
| 2014 | 5 | 3 |
| 2015 | 2 | 0 |
| 2016 | 1 | 2 |
| 2017 | 2 | 5 |
| 2018 | 3 | 7 |
| 2019 | 6 | 2 |
| 2020 | 2 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 3 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 3 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Conductive paste18 Nov 2025US 12,476,047 B2Murata Manufacturing Co., Ltd.
- Phosphor plate, light emitting device, and method for manufacturing phosphor plate22 Apr 2025US 12,284,848 B2Denka Company Limited
- High purity polysilocarb derived silicon carbide powder4 Feb 2025US 12,215,031 B2Pallidus, Inc.
- Transparent ceramic as a component for fracture-resistant optical units2 May 2023US 11,639,312 B2Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Transparent fluorescent sialon ceramic and method of producing same7 Sep 2021US 11,111,433 B2Kanagawa Institute of Industrial Science and Technology
- Method for manufacturing sintered compact and sintered compact5 Mar 2026US 2026/0062356 A1Nichia Corporation
- Conductive paste19 Feb 2026US 2026/0051439 A1Murata Manufacturing Co., Ltd.
- High purity polysilocarb derived silicon carbide materials, applications and processes24 Jul 2025US 2025/0236524 A1Pallidus, Inc.
- Conductive paste4 Jul 2024US 2024/0222017 A1Murata Manufacturing Co., Ltd.
- Method for preparing silicon nitride ceramic material7 Mar 2024US 2024/0076243 A1Shanghai Institute of Ceramics, Chinese Academy of Sciences
Most cited
By later US patents
- Illumination unit having at least one LED as light source105US 6,670,748 B2Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · 2003
- Light emitting device and illumination apparatus62US 7,253,446 B2Fujikura Ltd. · 2007
- Oxynitride phosphor activated by a rare earth element, and sialon type phosphor47US 6,632,379 B2National Institute for Materials Science · 2003
- Oxynitride phosphor activated by a rare earth element, and sialon type phosphor18US 6,776,927 B2National Institute for Materials Science · 2004
- Sialon-based oxynitride phosphor, process for its production, and use thereof13US 7,074,346 B2Ube Industries, Ltd. · 2006