H04M 1/78
Circuit arrangements in which low-frequency speech signals proceed in one direction on
Official title: Circuit arrangements in which low-frequency speech signals proceed in one direction on the line, while speech signals proceeding in the other direction on the line are modulated on a high-frequency carrier signal
H04M1/78 (Circuit arrangements in which low-frequency speech signals proceed in one direction on) appears on 60 US grants and 61 published applications in this corpus.
Search patents in H04M- Granted patents
- 60
- Published applications
- 61
- Assignees
- 9
- Inventors
- 25
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 5 | 24 |
| 2022 | 11 | 6 |
| 2023 | 15 | 15 |
| 2024 | 13 | 7 |
| 2025 | 3 | 4 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Acoustic output device and components thereof4 Aug 2026US 12,701,349 B2Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus and method thereof23 Jun 2026US 12,666,188 B2Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus with multiple sound guide holes and bluetooth low energy reciever25 Nov 2025US 12,483,817 B2Shenzhen Shokz Co., Ltd.
- Earphone without covering an ear canal25 Feb 2025US 12,238,470 B2Shenzhen Shokz Co., Ltd.
- Acoustic device21 Jan 2025US 12,207,034 B2Shenzhen Shokz Co., Ltd.
- Earphone without covering an ear canal12 Jun 2025US 2025/0193570 A1Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus30 Jan 2025US 2025/0039591 A1Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus and methods thereof23 Jan 2025US 2025/0030969 A1Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus9 Jan 2025US 2025/0016487 A1Shenzhen Shokz Co., Ltd.
- Open earphone19 Dec 2024US 2024/0422466 A1Shenzhen Shokz Co., Ltd.
Most cited
By later US patents
- Thermally coupled information transmission across electrical isolation boundaries71US 4,757,528 AHarris Corporation · 1988
- Intrinsically safe telephone67US 5,136,630 AGai-Tronics · 1992
- Field telephone system13US 4,847,888 AGulton Industries, Inc., Femco Division · 1989
- Open earphone10US 11,856,351 B2Shenzhen Shokz Co., Ltd. · 2023
- Personal computer assisted multiple line access9US 6,219,411 B1NCR Corporation · 2001