Inventor
APFEL RUSSELL J
38 patents
⚠️ This page may combine multiple inventors who share the name “APFEL RUSSELL J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SILICON LAB INC
11 patentsUS7793124B2Sep 7, 2010
System and method of classification in power over ethernet systems
SILICON LAB INC13 citations92
US7511930B2Mar 31, 2009
System and method for high voltage protection of powered devices
SILICON LAB INC10 citations84
US7548799B2Jun 16, 2009
Powered device including a detection signature resistor
SILICON LAB INC11 citations83
US7516340B2Apr 7, 2009
Powered device including a classification signature resistor
SILICON LAB INC15 citations83
US7960860B2Jun 14, 2011
Power sourcing equipment device including a serial interface
SILICON LAB INC5 citations74
US7647510B2Jan 12, 2010
System and method of classification in power over ethernet systems
SILICON LAB INC6 citations73
US7773354B2Aug 10, 2010
Voltage protection circuit for power supply device and method therefor
SILICON LAB INC3 citations63
US7477095B2Jan 13, 2009
Current mirror architectures
SILICON LAB INC5 citations63
US7970125B2Jun 28, 2011
Output stacking architecture for an amplifier
SILICON LAB INC3 citations60
US8019077B2Sep 13, 2011
Methods and apparatus for low voltage control of a subscriber line interface circuit
SILICON LAB INC0 citations52
US7688119B2Mar 30, 2010
Power supply with digital control loop
SILICON LAB INC0 citations40
APFEL RUSSELL J
8 patentsUS8831244B2Sep 9, 2014
Portable tone generator for producing pre-calibrated tones
APFEL RUSSELL J166 citations98
US8761421B2Jun 24, 2014
Portable electronic device and computer-readable medium for remote hearing aid profile storage
APFEL RUSSELL J57 citations97
US8649538B2Feb 11, 2014
Hearing aid having multiple sound inputs and methods therefor
APFEL RUSSELL J20 citations92
US8064179B2Nov 22, 2011
Integrated circuit including a switching regulator design for power over Ethernet devices
APFEL RUSSELL J27 citations92
US8538049B2Sep 17, 2013
Hearing aid, computing device, and method for selecting a hearing aid profile
APFEL RUSSELL J12 citations83
US8792661B2Jul 29, 2014
Hearing aids, computing devices, and methods for hearing aid profile update
APFEL RUSSELL J10 citations76
US9065657B2Jun 23, 2015
Powered device including a detection signature circuit
APFEL RUSSELL J2 citations62
US8249247B2Aug 21, 2012
Tracking voltage regulator for a subscriber line interface circuit
APFEL RUSSELL J0 citations41
ADVANCED MICRO DEVICES INC
8 patentsUS5694465ADec 2, 1997
Integrated ringer for short telephone lines
ADVANCED MICRO DEVICES INC59 citations96
US6351528B1Feb 26, 2002
Integrated ringer for short telephone lines
ADVANCED MICRO DEVICES INC14 citations92
US5619567AApr 8, 1997
Variable DC feed characteristic in a subscriber line interface circuit
ADVANCED MICRO DEVICES INC41 citations92
US4359609ANov 16, 1982
Circuit with feedback for controlling the impedance thereof
ADVANCED MICRO DEVICES INC32 citations92
US4315207AFeb 9, 1982
Current controlled battery feed circuit
ADVANCED MICRO DEVICES INC33 citations92
US4563548AJan 7, 1986
Method and circuit for telephone dialing signal generation
ADVANCED MICRO DEVICES INC23 citations78
US6026159AFeb 15, 2000
Integrated ringer for short telephone lines
ADVANCED MICRO DEVICES INC4 citations63
US5986290ANov 16, 1999
Silicon controlled rectifier with reduced substrate current
ADVANCED MICRO DEVICES INC5 citations63
LEGERITY INC
5 patentsUS6356624B1Mar 12, 2002
Method and apparatus for detecting and measuring foreign voltages
LEGERITY INC17 citations82
US7113590B2Sep 26, 2006
Method and apparatus for a differential feedback in an active impedence feedback circuit
LEGERITY INC10 citations74
US6956945B2Oct 18, 2005
Method and apparatus for phantom battery feed
LEGERITY INC9 citations74
US7215764B2May 8, 2007
Current sensing echo cancellation device
LEGERITY INC4 citations63
US7181002B2Feb 20, 2007
Method and apparatus for a single power supply for dual power mode
LEGERITY INC0 citations52
III HOLDINGS 4 LLC
3 patentsUS10462582B2Oct 29, 2019
Hearing aid and hearing aid dual use dongle
III HOLDINGS 4 LLC6 citations84
USRE47063ESep 25, 2018
Hearing aid, computing device, and method for selecting a hearing aid profile
III HOLDINGS 4 LLC2 citations72
US9503825B2Nov 22, 2016
Hearing aid and hearing aid dual use dongle
III HOLDINGS 4 LLC1 citations62