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Keith O. Johnson
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Pacifica, CA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Compensation system and method for sound reproduction
Patent number
7,184,556
Issue date
Feb 27, 2007
Microsoft Corporation
Keith O. Johnson
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Signal encode/decode system
Patent number
5,872,531
Issue date
Feb 16, 1999
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Systems for enhancing frequency bandwidth
Patent number
5,864,311
Issue date
Jan 26, 1999
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Hidden side code channels
Patent number
5,854,600
Issue date
Dec 29, 1998
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Systems for achieving enhanced amplitude resolution
Patent number
5,838,274
Issue date
Nov 17, 1998
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Systems for achieving enhanced frequency resolution
Patent number
5,808,574
Issue date
Sep 15, 1998
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Silent data conversion system with sampling during electrical silence
Patent number
5,640,161
Issue date
Jun 17, 1997
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Method and apparatus for slew limiting
Patent number
5,638,074
Issue date
Jun 10, 1997
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Compatible signal encode/decode system
Patent number
5,479,168
Issue date
Dec 26, 1995
Pacific Microsonics, Inc.
Keith O. Johnson
G06 - COMPUTING CALCULATING COUNTING
Patents Applications
last 30 patents
Information
Patent Application
Methods and apparatuses for adjusting sonic balace in audio reprodu...
Publication number
20040002781
Publication date
Jan 1, 2004
Keith O. Johnson
H04 - ELECTRIC COMMUNICATION TECHNIQUE