David Norton Critchlow

Person

San Diego, CA, US

People

Patents Grantslast 30 patents

Information Patent Grant
FIR chip for use in a wireless subscriber unit
- Patent number 6,724,851
- Issue date Apr 20, 2004
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit producing a modulated digital frequency
- Patent number 6,587,516
- Issue date Jul 1, 2003
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital synthesizer
- Patent number 6,449,317
- Issue date Sep 10, 2002
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital synthesizer
- Patent number 6,078,629
- Issue date Jun 20, 2000
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital subscriber communication system
- Patent number 5,859,883
- Issue date Jan 12, 1999
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital telephone system
- Patent number 5,842,137
- Issue date Nov 24, 1998
- InterDigital Technology Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital subscriber communication system
- Patent number 5,694,430
- Issue date Dec 2, 1997
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Balanced processing based on receiver selection
- Patent number 5,659,576
- Issue date Aug 19, 1997
- Hughes Electronics
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Direct digital frequency synthesizer for use in a subscriber unit o...
- Patent number 5,644,602
- Issue date Jul 1, 1997
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital subscriber communication system
- Patent number 5,325,396
- Issue date Jun 28, 1994
- InterDigital Technology Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Modem for fading digital channels affected by multipath
- Patent number 5,311,545
- Issue date May 10, 1994
- Hughes Aircraft Company
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System and method for transmission of bursts of digital information
- Patent number 5,282,226
- Issue date Jan 25, 1994
- Hughes Aircraft Company
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System and method for minimizing frequency offsets between digital...
- Patent number 5,276,706
- Issue date Jan 4, 1994
- Hughes Aircraft Company
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital telephone system
- Patent number 5,177,741
- Issue date Jan 5, 1993
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Automatic adaptive equalizer
- Patent number 5,168,507
- Issue date Dec 1, 1992
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Frequency synthesizer circuit
- Patent number 5,159,705
- Issue date Oct 27, 1992
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital subscriber communication system
- Patent number 5,146,473
- Issue date Sep 8, 1992
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital time-multiplexed quadrature frequency upconverter
- Patent number 5,101,418
- Issue date Mar 31, 1992
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Interpolator for varying a signal sampling rate
- Patent number 5,067,141
- Issue date Nov 19, 1991
- International Mobile Machine Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital subscriber communication system
- Patent number 5,008,900
- Issue date Apr 16, 1991
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Deglitching means for digital communication systems
- Patent number 4,996,697
- Issue date Feb 26, 1991
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital telephone system
- Patent number 4,994,802
- Issue date Feb 19, 1991
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital telephone system
- Patent number 4,943,983
- Issue date Jul 24, 1990
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital signals and frequency correction in a digital wireless system
- Patent number 4,893,317
- Issue date Jan 9, 1990
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
AM equalizer circuit for digital systems
- Patent number 4,881,240
- Issue date Nov 14, 1989
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber unit for wireless digital telephone system
- Patent number 4,825,448
- Issue date Apr 25, 1989
- International Mobile Machines Corporation
- David N. Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Modem for RF subscriber telephone system
- Patent number 4,764,940
- Issue date Aug 16, 1988
- International Mobile Machines Corporation
- Eric Paneth
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Modem for RF subscriber telephone system
- Patent number 4,644,561
- Issue date Feb 17, 1987
- International Mobile Machines Corp.
- Eric Paneth
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
System for processing digitized communication signals provided over...
- Publication number 20040190645
- Publication date Sep 30, 2004
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
FIR chip for use in a wireless subscriber unit
- Publication number 20030189988
- Publication date Oct 9, 2003
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Subscriber unit producing a modulated digital frequency
- Publication number 20030053553
- Publication date Mar 20, 2003
- InterDigital Technology Corporation
- David Norton Critchlow
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

David Norton Critchlow

Person

Patents Grantslast 30 patents

FIR chip for use in a wireless subscriber unit

Subscriber unit producing a modulated digital frequency

Digital synthesizer

Digital synthesizer

Subscriber unit for wireless digital subscriber communication system

Subscriber unit for wireless digital telephone system

Subscriber unit for wireless digital subscriber communication system

Balanced processing based on receiver selection

Direct digital frequency synthesizer for use in a subscriber unit o...

Subscriber unit for wireless digital subscriber communication system

Modem for fading digital channels affected by multipath

System and method for transmission of bursts of digital information

System and method for minimizing frequency offsets between digital...

Subscriber unit for wireless digital telephone system

Automatic adaptive equalizer

Frequency synthesizer circuit

Subscriber unit for wireless digital subscriber communication system

Digital time-multiplexed quadrature frequency upconverter

Interpolator for varying a signal sampling rate

Subscriber unit for wireless digital subscriber communication system

Deglitching means for digital communication systems

Subscriber unit for wireless digital telephone system

Subscriber unit for wireless digital telephone system

Digital signals and frequency correction in a digital wireless system

AM equalizer circuit for digital systems

Subscriber unit for wireless digital telephone system

Modem for RF subscriber telephone system

Modem for RF subscriber telephone system

Patents Applicationslast 30 patents

System for processing digitized communication signals provided over...

FIR chip for use in a wireless subscriber unit

Subscriber unit producing a modulated digital frequency