E04B 2001/8485
The opening being restricted
Official title: {the opening being restricted, e.g. forming Helmoltz resonators}
E04B2001/8485 (The opening being restricted) appears on 53 US grants and 51 published applications in this corpus.
Search patents in E04B- Granted patents
- 53
- Published applications
- 51
- Assignees
- 42
- Inventors
- 132
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 0 | 3 |
| 2008 | 2 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 2 |
| 2013 | 4 | 2 |
| 2014 | 3 | 1 |
| 2015 | 1 | 2 |
| 2016 | 0 | 0 |
| 2017 | 2 | 3 |
| 2018 | 2 | 4 |
| 2019 | 3 | 7 |
| 2020 | 2 | 3 |
| 2021 | 5 | 3 |
| 2022 | 2 | 1 |
| 2023 | 2 | 5 |
| 2024 | 1 | 3 |
| 2025 | 4 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sound insulating element and a suspended ceiling system6 Jan 2026US 12,516,523 B2Saint-Gobain Ecophon AB
- Perforated acoustic panel, method of producing, and use of the same28 Oct 2025US 12,455,072 B2Knauf Gips KG
- Method for manufacturing acoustical elements9 Sep 2025US 12,409,584 B2Saint-Gobain Ecophon AB
- Sound absorber8 Apr 2025US 12,270,165 B2Sealed Air Verpackungen GmbH
- Molded body, sound absorbing material, vibration absorbing material18 Feb 2025US 12,227,938 B2Tosoh Corporation
- Metabarrier for sound mitigation16 Apr 2026US 2026/0105903 A1Temple University of the Commonwealth System of Higher Education
- Sound isolating ventilation panels and methods for manufacturing same2 Jan 2025US 2025/0003630 A1Vanair Design Inc.
- Sound Reducing Enclosure and Enclosure Wall with Integral Tunable Resonator for Manufacturing Environment12 Dec 2024US 2024/0410165 A1The Boeing Company
- A sound insulating element and a suspended ceiling system11 Apr 2024US 2024/0117631 A1Saint-Gobain Ecophon AB
- Perforated acoustic panel, method of producing, and use of the same18 Jan 2024US 2024/0019116 A1Knauf Gips KG
Most cited
By later US patents
- Sound absorptive hollow core structural panel39US 6,021,612 AC&D Technologies, Inc. · 2000
- Soundproof structure38US 4,079,162 AAim Associates, Inc. · 1978
- Corrugated acoustical panel37US 8,251,175 B1USG Interiors, Inc. · 2012
- Acoustical board32US 3,991,848 AFrigitemp Corporation · 1976
- Sound-attenuating panel32US 5,457,291 A1995