LexDanaLexDanabeta
Inventor

Heping Ding

Inventor
Kanata, CA

Overview

14→
Patents
1998–2021
Patent span
Electricity
Primary field (CPC H)

Patents· 14 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Mprimary
H04MTelephonic communication22%
H03HImpedance networks, e.g. resonant circuits17%
H01LSemiconductor devices9%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems9%
H04BTransmission9%
G01FMeasuring volume, volume flow, mass flow or liquid level4%
G01SRadio direction-finding4%
G09GArrangements or circuits for control of indicating devices using static means to present variable information4%
G10LSpeech analysis techniques or speech synthesis4%
H03KPulse technique4%
PatentTitleYear
10,996,097System for sensing substance levels in a storage unit202110,778,104Efficient electricity conversion for harvesting energy from low voltage sources202010,644,044Methods of manufacturing printable photodetector array panels202010,476,367Voltage and current triggered switch, and step-down DC-DC converters containing such a switch20197,436,880'Adaptive filtering using fast affine projection adaptation'20087,330,812'Method and apparatus for transmitting an audio stream having additional payload in a hidden sub-channel'20086,788,785'Stable adaptive filter and method'20046,754,340'Stable adaptive filter and method'20046,687,723'Tri-mode adaptive filter and method'20046,226,380'Method of distinguishing between echo path change and double talk conditions in an echo canceller'20016,178,162'Method and apparatus for inhibiting echo in a channel of a communication system'20016,049,606'Circuit and method of double talk detection for use in handsfree telephony terminals'20005,838,787'Method and system for controlling echo return loss using a complementary variolosses in transmit path'19985,796,818'Dynamic optimization of handsfree microphone gain'1998

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1998Patents assigned to NORTHERN TELECOM LTD (2)· patent assignee history
1998–2004Based in Kanata, CA· patent location history
2000–2001Patents assigned to NORTEL NETWORKS CORP (2)· patent assignee history
2001–2004Patents assigned to NORTEL NETWORKS LTD (4)· patent assignee history
2004–2020Based in Ottawa, CA· patent location history
2008Patents assigned to CA NAT RESEARCH COUNCIL (2)· patent assignee history
2019–2020Patents assigned to NAT RES COUNCIL CANADA (3)· patent assignee history
2021Based in Plymouth, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
NORTEL NETWORKS LTD42001–2004
NAT RES COUNCIL CANADA32019–2020
CA NAT RESEARCH COUNCIL22008
NORTEL NETWORKS CORP22000–2001
NORTHERN TELECOM LTD21998
Locations
LocationPatentsSpan
Kanata, CA71998–2004
Ottawa, CA62004–2020
Plymouth, Minnesota, US12021