H04R 2307/021
Diaphragms comprising cellulose-like materials
Official title: Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen
H04R2307/021 (Diaphragms comprising cellulose-like materials) appears on 121 US grants and 148 published applications in this corpus.
Search patents in H04R- Granted patents
- 121
- Published applications
- 148
- Assignees
- 83
- Inventors
- 291
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 3 |
| 2005 | 1 | 2 |
| 2006 | 0 | 5 |
| 2007 | 1 | 5 |
| 2008 | 3 | 4 |
| 2009 | 1 | 7 |
| 2010 | 4 | 8 |
| 2011 | 6 | 9 |
| 2012 | 10 | 10 |
| 2013 | 9 | 1 |
| 2014 | 3 | 12 |
| 2015 | 8 | 6 |
| 2016 | 3 | 10 |
| 2017 | 8 | 4 |
| 2018 | 2 | 6 |
| 2019 | 6 | 8 |
| 2020 | 10 | 8 |
| 2021 | 2 | 10 |
| 2022 | 5 | 4 |
| 2023 | 5 | 7 |
| 2024 | 7 | 9 |
| 2025 | 3 | 8 |
| 2026 | 5 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Diaphragm, sound generation device, and method for manufacturing sound generation device11 Aug 2026US 12,707,216 B2LG Electronics Inc.
- Hybrid supported acoustic membrane assembly21 Jul 2026US 12,689,857 B2W. L. Gore & Associates, Inc.
- Multi-cone speaker28 Apr 2026US 12,615,478 B2Suzhou Sonavox Electronics Co., Ltd.
- Loudspeaker assembly10 Mar 2026US 12,574,686 B2Pss Belgium NV
- Composite material for acoustic transducer diaphragm6 Jan 2026US 12,520,083 B1Ora Graphene Audio Inc.
- Speaker Diaphragm and Speaker4 Jun 2026US 2026/0156416 A1Yamaha Corporation
- Nimo-based nanomaterial earphone diaphragm18 Dec 2025US 2025/0386159 A1Hifiman Kunshan Technology Group Co., Ltd.
- Cellulose composite pellets, diaphragm, and acoustic system9 Oct 2025US 2025/0312954 A1LG Electronics Inc.
- Display Device5 Jun 2025US 2025/0184656 A1Sony EMCS (Malaysia) SDN.BHD.
- Diaphragm for Speaker24 Apr 2025US 2025/0133344 A1Glass Acoustic Innovations Co., Ltd.
Most cited
By later US patents
- Acoustic diaphragm and method for producing same51US 5,274,199 ASony Corporation · 1993
- Loudspeaker43US 5,664,024 AMatsushita Electric Industrial Co., Ltd. · 1997
- In-wall speaker system method and apparatus22US 7,292,702 B2Dimensional Communications, Inc. · 2007
- Acoustic diaphragm21US 7,483,545 B22009
- Magnetic speaker20US 4,699,242 AChubu Cone Co., Ltd. · 1987