H04M 1/31
By interrupting current to generate trains of pulses
Official title: by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
H04M1/31 (By interrupting current to generate trains of pulses) appears on 65 US grants and 7 published applications in this corpus.
Search patents in H04M- Granted patents
- 65
- Published applications
- 7
- Assignees
- 41
- Inventors
- 104
- Latest grant
- 17 Mar 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 5 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 6 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 2 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 2 | 2 |
| 2020 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- H04M 1/312Pulses produced by electronic circuits54
- H04M 1/32Locking setting devices during transmission to prevent interference by user3
- H04M 1/38Pulses transmitted by a movement variably limited by the setting of a2
- H04M 1/315Clutches1
- H04M 1/34Lost-motion or other arrangements for ensuring a pause between successive digit transmissions0
- H04M 1/40Wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable0
Recent patents
- Electric circuit arrangement and a method for generating electric current pulses to a load17 Mar 2020US 10,594,318 B2City University of Hong Kong
- Physical layer circuitry for multi-wire interface25 Feb 2020US 10,574,431 B2M31 Technology Corporation
- Information processing device and information processing method17 Dec 2019US 10,511,702 B2Sony Corporation
- Physical layer circuitry for multi-wire interface16 Apr 2019US 10,263,762 B2M31 Technology Corporation
- Three-level power conversion circuit system11 Aug 2015US 9,106,155 B2Fuji Electric Co., Ltd.
- Physical layer circuitry for multi-wire interface30 May 2019US 2019/0165925 A1M31 Technology Corporation
- Electric circuit arrangement and a method for generating electric current pulses to a load28 Feb 2019US 2019/0068187 A1City University of Hong Kong
- Information processing device, information processing method, and program20 Dec 2018US 2018/0367659 A1Sony Corporation
- Physical layer circuitry for multi-wire interface8 Nov 2018US 2018/0323952 A1M31 Technology Corporation
- Three-level power conversion circuit system4 Sep 2014US 2014/0247634 A1Fuji Electric Co., Ltd.
Most cited
By later US patents
- Telephone line interface and dialer circuitry for telecommunications equipment109US 4,723,267 AOctocom Systems, Inc. · 1988
- Intrinsically safe telephone62US 4,741,031 AGai-Tronics · 1988
- Electronic headset telephone36US 4,975,949 APlantronics, Inc. · 1990
- Circuit arrangements in telephone apparatus25US 3,956,596 AGeneral Electric Company · 1976
- Subscriber telephone set incorporating overvoltage protection22US 4,475,012 AU. S. Philips Corporation · 1984