H03F 3/52
With tubes only
Official title: with tubes only
H03F3/52 (With tubes only) appears on 10 US grants and 10 published applications in this corpus.
Search patents in H03F- Granted patents
- 10
- Published applications
- 10
- Assignees
- 3
- Inventors
- 13
- Latest grant
- 30 May 2017
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 3 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 4 |
| 2016 | 3 | 1 |
| 2017 | 2 | 0 |
By publication year.
Recent patents
- Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path30 May 2017US 9,666,176 B2Cirrus Logic, Inc.
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device21 Feb 2017US 9,578,417 B2Cirrus Logic, Inc.
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device25 Oct 2016US 9,479,868 B2Cirrus Logic, Inc.
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device25 Oct 2016US 9,479,869 B2Cirrus Logic, Inc.
- Circuit to extend frequency response of accelerometer6 Sep 2016US 9,435,824 B2
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device9 Jun 2016US 2016/0165348 A1Cirrus Logic, Inc.
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device19 Mar 2015US 2015/0078559 A1Cirrus Logic, Inc.
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device19 Mar 2015US 2015/0078560 A1Cirrus Logic, Inc.
- Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path19 Mar 2015US 2015/0078572 A1Cirrus Logic, Inc.
- Circuit to extend frequency response of accelerometer29 Jan 2015US 2015/0027199 A1
Most cited
By later US patents
- Linear high-voltage drive stage and cathode-follower high-fidelity power amplifier implementing same3US 6,265,938 B12001
- Systems and methods for detection of load impedance of a transducer device coupled to an audio device3US 9,479,868 B2Cirrus Logic, Inc. · 2016
- Output circuit of vacuum-tube amplifier2US 7,355,475 B2AVERD Labs Co., Ltd. · 2008
- Single stage balanced voltage amplifier1US 7,482,867 B22009
- Single-ended screen-regulated cathode-follower output stage for high-fidelity music amplifier1US 7,511,571 B22009