Inventor · disambiguated record
Lawrence F. Heyl
Also filed as: HEYL LAWRENCE · HEYL LAWRENCE F · HEYL LAWRENCE FREDERICK
32 granted patents·6 pending applications·518 citations·filing 1993–2021
97Inventor score
Top patents by PatentIndex Score
38 records- 0198US9454893B1Systems and methods for coordinating and administering self tests of smart home devices having audible outputsGOOGLE INC·Filed 2015·Granted Sep 27, 2016·60 cites·4 claims
- 0292US8340312B2Differential mode noise cancellation with active real-time control for microphone-speaker combinations used in two way audio communicationsJOHNSON TIMOTHY M·Filed 2009·Granted Dec 25, 2012·29 cites·20 claims
- 0390US5398003APulse width modulation speaker amplifierAPPLE COMPUTER·Filed 1994·Granted Mar 14, 1995·58 cites·19 claims
- 0488US8332664B2Systems and methods for providing device-to-device handshaking through a power supply signalFARRAR DOUG·Filed 2008·Granted Dec 11, 2012·17 cites·20 claims
- 0586US5570296ASystem and method for synchronized presentation of video and audio signalsAPPLE COMPUTER·Filed 1994·Granted Oct 29, 1996·80 cites·13 claims
- 0683US8812883B2Systems and methods for providing device-to-device handshaking through a power supply signalFARRAR DOUG·Filed 2012·Granted Aug 19, 2014·7 cites·20 claims
- 0782US9886843B2Systems and methods for coordinating and administering self tests of smart home devices having audible outputsGOOGLE LLC·Filed 2016·Granted Feb 6, 2018·3 cites·17 claims
- 0882US5613010AApparatus for reproducing sound with a reduced dynamic rangeAPPLE COMPUTER·Filed 1994·Granted Mar 18, 1997·36 cites·20 claims
- 0979US8369534B2Mode switching noise cancellation for microphone-speaker combinations used in two way audio communicationsAPPLE INC·Filed 2012·Granted Feb 5, 2013·4 cites·15 claims
- 1077US8150058B2Mode switching noise cancellation for microphone-speaker combinations used in two way audio communicationsJOHNSON TIMOTHY M·Filed 2009·Granted Apr 3, 2012·4 cites·17 claims
- 1176US5508812ASystem for processing and recording digital color television signal onto analog video tapeAPPLE COMPUTER·Filed 1994·Granted Apr 16, 1996·27 cites·27 claims
- 1271US9780743B2Light sensor readout system and method of converting light into electrical signalsGOOGLE INC·Filed 2015·Granted Oct 3, 2017·2 cites·14 claims
- 1371US5774567AAudio codec with digital level adjustment and flexible channel assignmentAPPLE COMPUTER·Filed 1995·Granted Jun 30, 1998·58 cites·13 claims
- 1470US10380878B2Systems and methods for coordinating and administering self tests of smart home devices having audible outputsGOOGLE LLC·Filed 2018·Granted Aug 13, 2019·1 cites·21 claims
- 1567US8358788B2Noise cancellation for microphone-speaker combinations using combined speaker amplifier and reference sensingAPPLE INC·Filed 2009·Granted Jan 22, 2013·5 cites·29 claims
- 1665US7039203B2Reduced complexity audio mixing apparatusAPPLE COMPUTER·Filed 2001·Granted May 2, 2006·8 cites·14 claims
- 1764US5357214AMethods and apparatus for microphone preamplificationAPPLE COMPUTER·Filed 1993·Granted Oct 18, 1994·17 cites·6 claims
- 1862US5486929ATime division multiplexed video recording and playback systemAPPLE COMPUTER·Filed 1993·Granted Jan 23, 1996·21 cites·38 claims
- 1959US5424678AMuting of computer sound system during power cyclingAPPLE COMPUTER·Filed 1994·Granted Jun 13, 1995·15 cites·5 claims
- 2056US5887177AHost-controlled power management of a computer sound systemAPPLE COMPUTER·Filed 1996·Granted Mar 23, 1999·17 cites·1 claims
- 2156US2014351622A1Systems and methods for providing device-to-device handshaking through a power supply signalAPPLE INC·Filed 2014·Application pending·0 cites
- 2255US9898922B2Systems and methods for coordinating and administering self tests of smart home devices having audible outputsGOOGLE INC·Filed 2016·Granted Feb 20, 2018·0 cites·13 claims
- 2353US10121333B2Device with precision frequency stabilized audible alarm circuitGOOGLE INC·Filed 2017·Granted Nov 6, 2018·0 cites·5 claims
- 2448US10320347B2Light sensor readout system and method of converting light into electrical signalsGOOGLE INC·Filed 2017·Granted Jun 11, 2019·0 cites·7 claims
- 2548US2017193762A1Device with precision frequency stabilized audible alarm circuitGOOGLE INC·Filed 2015·Application pending·0 cites
- 2647US7358884B1Methods and systems for implementing a Digital-to-Analog ConverterAPPLE INC·Filed 2006·Granted Apr 15, 2008·1 cites·31 claims
- 2746US2009171670A1Systems and methods for altering speech during cellular phone useAPPLE INC·Filed 2008·Application pending·0 cites
- 2846US2024054988A1Reduced Complexity Implementation for Acoustic Noise CancelingGOOGLE LLC·Filed 2021·Application pending·0 cites
- 2943US9953516B2Systems and methods for self-administering a sound testGOOGLE LLC·Filed 2015·Granted Apr 24, 2018·0 cites·35 claims
- 3043US5598353AMethod and apparatus for combining a multiple-bit digital audio signal with a single-bit digital audio signalAPPLE COMPUTER·Filed 1994·Granted Jan 28, 1997·14 cites·19 claims
- 3143US5517572AMethods and apparatus for connecting and conditioning audio signalsAPPLE COMPUTER·Filed 1993·Granted May 14, 1996·7 cites·13 claims
- 3243US2003033153A1Microphone elements for a computing systemAPPLE COMPUTER·Filed 2002·Application pending·0 cites
- 3338US5440643AAudio peripheral mixer circuit and method for noise reductionAPPLE COMPUTER·Filed 1993·Granted Aug 8, 1995·9 cites·8 claims
- 3436US6404892B1Reduced complexity audio mixing apparatusAPPLE COMPUTER·Filed 1997·Granted Jun 11, 2002·4 cites·9 claims
- 3536US5631966AAudio signal conversion using frequency band divisionAPPLE COMPUTER·Filed 1994·Granted May 20, 1997·4 cites·25 claims
- 3636US5621535ADirect digital synthesis of video signal recording waveforms from baseband digital signals provided by a computer interface for compatible recording onto analog video tapeAPPLE COMPUTER·Filed 1995·Granted Apr 15, 1997·5 cites·23 claims
- 3736US2018018970A1Neural network for recognition of signals in multiple sensory domainsGOOGLE INC·Filed 2016·Application pending·0 cites
- 3835US5621472ASystem for inexpensive phase coherent subcarrier generationAPPLE COMPUTER·Filed 1994·Granted Apr 15, 1997·5 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →