C01B 21/00
Nitrogen
Official title: Nitrogen; Compounds thereof
C01B21/00 (Nitrogen) appears on 3,438 US grants and 3,028 published applications in this corpus.
Search patents in C01B- Granted patents
- 3,438
- Published applications
- 3,028
- Assignees
- 1,615
- Inventors
- 7,863
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 66 | 0 |
| 1977 | 63 | 0 |
| 1978 | 52 | 0 |
| 1979 | 41 | 0 |
| 1980 | 38 | 0 |
| 1981 | 43 | 0 |
| 1982 | 33 | 0 |
| 1983 | 51 | 0 |
| 1984 | 37 | 0 |
| 1985 | 54 | 0 |
| 1986 | 34 | 0 |
| 1987 | 46 | 0 |
| 1988 | 46 | 0 |
| 1989 | 63 | 0 |
| 1990 | 60 | 0 |
| 1991 | 64 | 0 |
| 1992 | 68 | 0 |
| 1993 | 76 | 0 |
| 1994 | 58 | 0 |
| 1995 | 69 | 0 |
| 1996 | 54 | 0 |
| 1997 | 55 | 0 |
| 1998 | 51 | 0 |
| 1999 | 41 | 0 |
| 2000 | 42 | 0 |
| 2001 | 58 | 7 |
| 2002 | 37 | 51 |
| 2003 | 53 | 64 |
| 2004 | 43 | 83 |
| 2005 | 38 | 65 |
| 2006 | 46 | 53 |
| 2007 | 40 | 61 |
| 2008 | 34 | 60 |
| 2009 | 48 | 74 |
| 2010 | 46 | 90 |
| 2011 | 50 | 64 |
| 2012 | 44 | 120 |
| 2013 | 71 | 108 |
| 2014 | 88 | 124 |
| 2015 | 107 | 145 |
| 2016 | 99 | 146 |
| 2017 | 132 | 162 |
| 2018 | 118 | 164 |
| 2019 | 148 | 183 |
| 2020 | 131 | 178 |
| 2021 | 123 | 212 |
| 2022 | 118 | 192 |
| 2023 | 132 | 169 |
| 2024 | 118 | 174 |
| 2025 | 135 | 168 |
| 2026 | 76 | 111 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01B 21/06Binary compounds of nitrogen with metals, with silicon, or with boron, or1,422
- C01B 21/082Compounds containing nitrogen and non-metals and optionally metals971
- C01B 21/20Nitrogen oxides728
- C01B 21/04Purification or separation of nitrogen345
- C01B 21/02Preparation of nitrogen98
- C01B 21/08Hydrazoic acid19
Recent patents
- Boron nitride particles, resin composition, and method for producing resin composition6 Oct 2026US 12,753,075 B2Denka Company Limited
- Boron nitride powder, method of manufacturing boron nitride powder, resin material, and method of manufacturing resin material6 Oct 2026US 12,753,076 B2Jfe Steel Corporation
- Solid-gas reaction to generate nitroxyl (HNO) in the gas phase22 Sep 2026US 12,740,999 B2Consejo Nacional De Investgaciones Cientficas Y Tecnicas Conicet
- Boron nitride particles, resin composition, and method for producing resin composition22 Sep 2026US 12,742,057 B2Denka Company Limited
- Gauzes having a tertiary structure for the catalytic conversion of fluids15 Sep 2026US 12,734,513 B2
- Production method for boron nitride particles, production method for resin composition, and uses therefor8 Oct 2026US 2026/0307992 A1Resonac Corporation
- Plasma enhanced vapor deposition methods and systems for forming low-k material films1 Oct 2026US 2026/0297745 A1ASM IP Holding B. V.
- Hexagonal boron nitride powder and method for producing same24 Sep 2026US 2026/0285682 A1Tokuyama Corporation
- Method for preparing boron nitride nanosheets, method for preparing boron nitride nanosheet-based fibers, and fibers prepared thereby24 Sep 2026US 2026/0285683 A1Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
- Hexagonal boron nitride powder and production method therefor17 Sep 2026US 2026/0274669 A1Tokuyama Corporation
Most cited
By later US patents
- Method and apparatus for the generation of nitric oxide499US 5,827,420 AWorld Precision Instruments, Inc. · 1998
- Thermal oxide equivalent low temperature ALD oxide for dual purpose gate oxide and method for producing the same426US 10,106,892 B1Globalfoundries Inc. · 2018
- Method of topologically restricted plasma-enhanced cyclic deposition of silicon or metal nitride426US 10,340,135 B2ASM IP Holding B. V. · 2019
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Vapor deposition reactor and method for forming thin film349US 8,758,512 B2Veeco ALD Inc. · 2014