Inventor

Dennis L. Welty

Inventor

Mesa, AZ, US

Overview

13→

Patents

1984–2001

Patent span

Electricity

Primary field (CPC H)

Patents· 13 as inventor

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

H04Mprimary

H04MTelephonic communication30%

H03FAmplifiers13%

H03DDemodulation or transference of modulation from one carrier to another9%

H03GControl of amplification9%

H04BTransmission9%

H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers9%

G05BControl or regulating systems in general4%

H02HEmergency protective circuit arrangements4%

H03KPulse technique4%

Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use4%

PatentTitleYear

6,263,199'Circuit and method of signal frequency conversion'2001 6,104,227'RF mixer circuit and method of operation'2000 5,329,585'Subscriber line interface circuit for controlling AC and DC output impedance'1994 5,198,957'Transient protection circuit using common drain field effect transistors'1993 4,994,758'Alpha enhancement of a transistor using base current feedback to the emitter'1991 4,724,540'Speakerphone with fast idle mode'1988 4,720,856'Control circuit having a direct current control loop for controlling the gain of an attenuator'1988 4,689,506'Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature'1987 4,648,103'Flip-flop having divide inhibit circuitry to change divide ratio'1987 4,599,494'Ring sense telephone tone ringer circuit'1986 4,491,804'Bias circuit which is independent of output device voltage characteristics for biasing an amplifier in class AB operation'1985 4,485,341'Current limiter circuit'1984 4,431,874'Balanced current multiplier circuit for a subscriber loop interface circuit'1984

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1984–2001Patents assigned to MOTOROLA INC (13)· patent assignee history

1984–2001Based in Mesa, AZ, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MOTOROLA INC	13	1984–2001

Locations

Location	Patents	Span
Mesa, AZ, US	13	1984–2001